Can someone help me make this fire script repeat itself in a curtain amount of time?

I've been working on this game for a few days now and I just got a fire script for it. It works and everything but when I put out the fire the script doesn't know when the fire is put out. So I tried looking up how to repeat the script to keep doing the same thing over and over again. But I couldn't find anything useful can someone please help me with my problem. I do not know how to script so this is my last chance of finding success.

This is the script I want repeating itself BUT I want it to repeat itself in a certain amount of time so I don't have multiple fires at once.

wait(150)

local Buildings = {}

for i,v in pairs(workspace:GetChildren()) do
    if v:IsA("Model") and v:FindFirstChild("FireActive") and v:FindFirstChild("SoundPart") then
        table.insert(Buildings, v)
    end
end

function Ignite(part)
    local realFire = Instance.new("Fire", part)
    realFire.Size = 20
    realFire.Heat = 20
    realFire.Enabled = false
    for _,particle in pairs(script.FireParticles:GetChildren()) do
            local newparticle = particle:Clone()
            newparticle.Parent = part
            newparticle.Enabled = true
            if newparticle.Name == "FireP" and newparticle:IsA("ParticleEmitter") then
                local factor = (part.Size.X)*(part.Size.Y)*(part.Size.Z)*0.4 + 1.5
                newparticle.Rate = factor
            elseif newparticle:IsA("ParticleEmitter") then
                local factor = (part.Size.X)*(part.Size.Y)*(part.Size.Z)*0.13 + 1.5
                newparticle.Rate = factor
            end
    end
    script.FireExtinguishScript:clone().Parent = part
    part.FireExtinguishScript.Disabled = false
end

function SetFire(building)
    local RandomNumber = math.random(1,3)
    if RandomNumber == 1 then --large fire
        print("Starting Large Fire: "..building.Name)
        for i,part in pairs(building:GetChildren()) do
            wait(0.2)
             if part:IsA("BasePart") and part.Name ~= "SoundPart" and part.Name ~= "SmokePart" and part.Name ~= "NonFlammable"  then
                Ignite(part)
            elseif part:IsA("Model") and part.Name == "COLOR" then
                for i,v in pairs(part:GetChildren())do if v:IsA("BasePart") and part.Name ~= "SoundPart" and part.Name ~= "SmokePart" and part.Name ~= "NonFlammable"  then Ignite(v) end end
            elseif part.Name == "SmokePart" then
                local Newsmoke = script.FireParticles.Smoke:Clone()
                Newsmoke.Parent = part
                Newsmoke.Rate = (part.Size.X)*(part.Size.Y)*(part.Size.Z)*0.3 + 1.5
                Newsmoke.Enabled = true
            elseif part.Name == "SoundPart" then
                script.FireAlarm:clone().Parent = part
                part.FireAlarm.Script.Disabled = false
            end
        end
    else --small fire 
        print("Starting Small Fire: "..building.Name)
        local MainPart = nil
        local function pickMainPart()
            local MainPartNumber = math.random(1,#building:GetChildren())
            local MainPart2 = building:GetChildren()[MainPartNumber]
            if MainPart2:IsA("BasePart") then 
                MainPart = MainPart2
            else
                pickMainPart()
            end
        end
        pickMainPart()
        for i,part in pairs(building:GetChildren()) do
            wait(0.1)
            if part:IsA"BasePart" and (part.Position - MainPart.Position).magnitude < math.random(10,25) and part.Name ~= "SoundPart" and part.Name ~= "SmokePart" and part.Name ~= "NonFlammable" then
                Ignite(part)
            elseif part:IsA("Model") and part.Name == "COLOR" then
                for i,v in pairs(part:GetChildren())do 
                    if v:IsA("BasePart") and (v.Position - MainPart.Position).magnitude < math.random(10,25) then Ignite(v) end 
                end
            elseif part.Name == "SmokePart" then
                --no smoke
            elseif part.Name == "SoundPart" then
                script.FireAlarm:clone().Parent = part
                part.FireAlarm.Script.Disabled = false
            end
        end
    end
    --set off server things/911 call here:
    game.ReplicatedStorage.GameplayUIs.Radio.fireCall:Fire(building.Name)
    building.FireActive.Value = true
end

function RemoveFire(building)
    for i,part in pairs(building:GetChildren()) do
        if part.Name ~= "SoundPart"  then
            for i,child in pairs(part:GetChildren()) do
                if child:IsA("ParticleEmitter") or child.Name == "FireLight" then
                    child:Destroy()
                end
            end
            if part:FindFirstChild("Fire") then part.Fire:Destroy() end
        elseif part.Name == "COLOR" and part:IsA("Model") then
            for i,p in pairs (part:GetChildren()) do
                for i,child in pairs(p:GetChildren()) do
                    if child:IsA("ParticleEmitter") or child.Name == "FireLight" then
                        child:Destroy()
                    end
                end
                if p:FindFirstChild("Fire") then p.Fire:Destroy() end
            end
        elseif part.Name == "SoundPart" then
            if part:FindFirstChild("WhiteLight") then part.WhiteLight:Destroy() end
            if part:FindFirstChild("FireAlarm") then part.FireAlarm:Destroy() end
            if part:FindFirstChild("FireSound") then part.FireSound:Destroy() end
        end
    end
    building.FireActive.Value = false
end

function CheckFireStatus(building)
    local count = 0
    for i,v in pairs(building:GetChildren()) do
        if v:findFirstChild("Fire") then
            count = count + 1
        end
    end
    if count == 0 then
        RemoveFire(building)
        building.FireActive.Value = false
    end
end


--Start fires:
while wait(100) do
    local firefighters = 0
    for i,v in pairs(game.Players:GetPlayers()) do
        if v.TeamColor == BrickColor.new("Maroon") then
            firefighters = firefighters + 1
        end
    end
    if firefighters >= 1 then
        local RandomNumber = math.random(1, #Buildings)
        local RandomBuilding = Buildings[RandomNumber]
        SetFire(RandomBuilding)
        wait(180)--save resources 
        repeat CheckFireStatus(RandomBuilding) wait(30) until RandomBuilding.FireActive.Value == false
        wait(math.random(20*60, 25*60)) 
    end
end