I think 24 hours may be a bit much for a one time offense, but is fine for repeat offenders. Sometimes things just happen.

However (as we've seen multiple times here), a lot of people like to grief the DF. I've had people go into AK, look at everyone's gear, and leave. I also remember way back someone mentioned a tank who AFKed at the start of the duty, came back, asked how long DPS had been waiting, laughed at them, and left. For those kinds of people, I think 24 hours is justified.