How can I correct the timer in this surfacegui?

I´m reading the script fundamentals material from the roblox education page https://education.roblox.com/en-us/resources/intro-to-coding-coding-3-multiple-conditions-with-if-elseif-and-else ... The lecture (if this can be considered as one), tells me to make a finish line part and some optional challenges. One of them is to make a part that resets the time of the run, the other one is about a surfacegui where I´m told to print the current time of the run, until the end. Also there´s a reamining challenge with tables, but, since I don´t know how to use them yet, I´ve skipped it by now.

this code is what I´ve came up to do the 1st and 2nd challenges:

local endpart=script.Parent
racetime=0
local display= game.Workspace.displayInformation
local textzone=display.SurfaceGui.TextLabel
local startpart=game.Workspace.start

local function start(anypart)
	local chara=anypart.Parent
	local  human= chara:FindFirstChildWhichIsA("Humanoid")
	if human then
		raceActive=true
		while raceActive==true do
			wait(1)
			racetime=racetime+1
			print(racetime)
			textzone.Text=racetime
			
		end
	end
end 
local function finish()
	print("part is being touched")
	raceActive=false
	if racetime<=30 then
		textzone.Text="gold"
	elseif racetime>30 and racetime<=40 then
		textzone.Text="silver"
	elseif racetime>40 and racetime<=45 then 
		textzone.Text="bronze"
	else 
		textzone.Text="try again"
	end
	racetime=0

end
local function finished(anypart)
	local chara=anypart.Parent
	local human=chara:FindFirstChildWhichIsA("Humanoid")
	if human and raceActive==true then
		finish()
	end
end
startpart.Touched:Connect(start)
endpart.Touched:Connect(finished)

I have a problem when touching the startpart, it seems like its printing the next 4 seconds" each second

Btw. If you find a grammar mistake,word misspelling or another comunicative issue write me the correction pls :p. Ty for reading!!

I had made another function to trigger the RaceActive boolean to be true... If it is helpful to anyone...

local endpart=script.Parent
racetime=0
local display= game.Workspace.displayInformation
local textzone=display.SurfaceGui.TextLabel
local startpart=game.Workspace.start
--start display
local function start(anypart)
	local chara=anypart.Parent
	local  human= chara:FindFirstChildWhichIsA("Humanoid")
	if human then
		while raceActive==true do
			racetime=racetime+1
			textzone.Text=racetime
			wait(1)
		end
	end
end 

local function finished(anypart)
	local chara=anypart.Parent
	local human=chara:FindFirstChildWhichIsA("Humanoid")
	if human and raceActive==true then
		print("part is being touched")
		raceActive=false
		if racetime<=30 then
			textzone.Text="gold"
		elseif racetime>30 and racetime<=40 then
			textzone.Text="silver"
		elseif racetime>40 and racetime<=45 then 
			textzone.Text="bronze"
		else 
			textzone.Text="try again"
		end
		racetime=0
	end
end
local function trigger(any)
	local part=any.Parent
	local human=part:FindFirstChildWhichIsA("Humanoid")
	if human then
		raceActive=true
	end
end
startpart.Touched:Connect(trigger)
startpart.Touched:Connect(start)
endpart.Touched:Connect(finished)

Although, I don´t know why works properly in this way