Is There a Way to Improve My Weekly Time Calculations?

Help and Feedback Code Review
1

So, I’m in the midst of making a game, and I’ve put together a script that calculates the time left in a week for uses in daily challenges, weekly challenges, and a weekly shop by setting the calculation to a formatted string value. My question is, will this loop cause any issues relating to performance, and is there any way to make it a bit better.

Here’s my code:

local rs = game:GetService('ReplicatedStorage')
local values = rs:WaitForChild("Values") -- Value folder in ReplicatedStorage
local weekTimeLeft = values:WaitForChild("WeekTimeLeft") -- String value for tracking the time

local modelSunday = os.time({year = 2020, month = 9, day = 27}) -- Reference point for a past sunday.

local function toDHMS(t)
	
	return string.format("%02d:%02d:%02d:%02d", math.floor(t/60/60/24), math.floor(t/60/60%24), math.floor(t/60%60), math.floor(t%60))
	
end

local weekLength = 60 * 60 * 24 * 7

while wait(1) do
	local goal = modelSunday
	
	while goal < os.time() do
		goal += weekLength
	end
	
	local timeLeft = goal - os.time()
	
	if timeLeft > 0 then
		weekTimeLeft.Value = toDHMS(timeLeft)
	else
		weekTimeLeft.Value = "00:00:00:00"
	end
end

Thanks in advance!