Convert number of seconds to a TTS friendly format

[etron]

I use the code below to announce the values of my Elk M1 counters, which are used as timers.

local function FormatForTTS(sSeconds)
	local nSeconds = tonumber(sSeconds)
	local sTTS = ""
	if nSeconds < 60 then
		return "timer has expired"
	else
		nHours = math.floor(nSeconds/3600)

		if nHours > 1 then
		  wHours = nHours.." hours"
		end
		if nHours == 1 then
		  wHours = "1 hour"
		end
		if nHours == 0 then
		  wHours = ""
		end
		
		nMins = math.floor(nSeconds/60 - (nHours*60));

		if nMins > 1 then
		  wMins = nMins.." minutes"
		end
		if nMins == 1 then
		  wMins = "1 minute"
		end
		if nMins == 0 then
		  wMins = ""
		end
		
		nSecs = math.floor(nSeconds - nHours*3600 - nMins *60);
		
		if nSecs > 1 then
		  wSecs = nSecs.." seconds"
		end
		if nSecs == 1 then
		  wSecs = "1 second"
		end
		if nSecs == 0 then
		  wSecs = ""
		end

		-- putting it all together now
		if nHours > 0 then
		  sTTS = sTTS .. wHours
		  if nMins  > 0 then
		    sTTS = sTTS .. " and "
		  end
		end
		
		if nMins > 0 then
		  sTTS = sTTS .. wMins
		  if nSecs > 0 then
		    sTTS = sTTS .. " and "
		  end
		end
		
		if nSecs > 0 then
		  sTTS = sTTS .. wSecs
		end
		
		return "Time remaining: " .. sTTS
	end
end