what is a good way to script so that a loop goes when a condition is true while counting up?

For example, if I wanna create a flag capture point, would this be a good idea to check if the player is on for 10 seconds?:

while wait(1) do
if mag < 10 then
i = i + 1
if i == 10 then
    print("captured")
        end
    end
end