help! new schedule and late to feed kitties

here's the situation:

i work from 6:30am - ???. kitties get fed 1/2 a 6oz can of Urinary SO at around 5:50-6am before i leave for work. mondays and tuesdays are usually my heavy work days, so i've been asking my roommate (who was on night shift) to feed them 1/4 a can before she leaves. on mon and tues, i usually don't return home until after 5pm..sometimes 6pm or later (on lighter days i return anywhere from 3:30pm-4:30pm). 

now, my roommate has a new schedule (day shift), and the holidays are coming up so i will probably be leaving later and later during my heavier days. my concern is.. is it ok for them to go so long without being fed? i can't feed them any dry food because one of them has crystals. my commute can take anywhere from 15min to 1hr depending on traffic, and my boss absolutely will not let me leave work.

i should also mention that i live in a state where i don't have any family nearby, nor do i trust anyone else to have keys to my apartment.

if anyone has any suggestions or ideas, i would really appreciate it.

Are they adults? If so, two meals spaced about 12 hours apart would be fine; even an occasional 13-hour gap won't hurt them. If they're kittens, they need to be fed more often, and it would be advisable to look at automatic feeders. There are some, like the Catmate, that you can use cold packs with to keep canned food fresh.

I have a friend who freezes the food in an ice cube tray. She pops out a few cubes into a dish, and her cats eat it four or five hours later after it's thawed.

Try a programmable feeder such as this one. Such feeders can be used with canned food. You can freeze food into portion sizes and pop the cubes into the feeder. Since it takes a bit of time fora cube to defrost enough for a cat to eat, the first meal in the feeder should be straight from the can.

Unless the cats have a medical condition where they need t have scheduled meals so medicine can be given (such ss diabetes), it's fine for a cat to go 12 hours or slightly more between meals. They'll be super hungry and ready to eat when you get home