I added 7 x 100ths to the 'hundredths' each loop. Now it's almost accurate to an hour.. just got to tweak it a little more.
Don't do that! There's a flaw in your Sketch that needs to be fixed. Fixing the flaw will very likely correct the timing error.
Do you want hints so you can try to figure out the problem on your own or do you want a straight-up full description?