Krausen depends on how you handled your yeast, usually 12-48 hours, but sometimes there can be a longer lag time.
If by day 3 you still don't see any signs of fermentation then I'd probably repitch with the same yeast. Sometimes krausen doesn't form well or it falls before you get a chance to see it.
As far as starting gravity was this an extract or all-grain kit? If you're a quart of liquid short or got a higher extract efficiency than the recipe accounted for that would explain the higher gravity. The only 'downside' is you get buzzed faster.
Unless you're on a tight schedule there's no need to check gravity until you're ready to bottle. The kit probably gave a time table but 7-14 days is pretty average for low-moderate gravity beers.
check the gravity a few days apart and if it has dropped and holds steady, it is good to package.
Like Kaz said you just want to make sure fermentation is complete so you don't get gushers or bottle bombs when you bottle.
1°:Haphazard cyser, Graham's English Cider, Cider; Conditioning: Banana wine, Cider, Orange/Clover blossom mead, Cyser, JAOM, In like a Lion RIS ; Drinking: In like a Lion RIS; Mango Melomel