The shorter runs are useful, you will struggle to run long every time you go out for obvious reasons.
Depending on your previous session in the 24/48 hours before you could use your morning run for recovery. 60 mins very easy.
If you have had an easy day or 2 before hand than you could use it as a tempo run. Avoid going flat out into it, use the first mile as a warm up building up to your tempo pace and then maintaining that for the remainder of the session. Same could be said for a hill session maybe, warm up to the hill. 20 mins of hill reps, run back.
You could also use that time for other options if it is the morning following a long or tough session. e.g x-training, stretching or foam rolling?
There are plenty of ways to use the time available.