When at home, fire crews allegedly get an hour a day to work out. However, it often doesn't happen, because the phone is ringing, pilots are showing up, and fires are lurking. If I get to exercise, it's more often than not cut short. Some people just give up, and it would be easy to do. If you are used to exercising for an hour or more, it's hard to adjust to half an hour or less and feel good about it.
This is where I have to take a step back and look at the big picture. Sure, a 3 mile run isn't going to burn a lot of calories or improve my fitness at this point. Lifting weights sporadically instead of on a schedule won't build muscle. But if fitness is a journey, this is just a little while spent at the station. As fall approaches and then as winter comes, there will be time to get on the workout train again.
So if you need to, embrace the maintenance phase. If you can only run for half an hour, really enjoy that half hour. Look at everything around you (I surprised some bears the other day on my run). If you can only lift weights once in awhile, try a new exercise. There will be time to go back to more intense exercise when you can. Enjoy the break!