I assisted a professor in writing a paper and it got accepted in a journal with minor reviews. I did the modifications I was asked to address and have been waiting on the professor the rest of the time. I've done friendly reminders once or twice to ask what's going on with the paper but decided to drop the ball as I know they are quite busy. This publication is also obviously more important for me as I don't have anything out there yet, so I'm not so surprised it's probably sitting on a hard drive somewhere. We have a great relationship and there will be opportunities for more publications later on. Still, it was a lot of work for me so I'm keeping my hopes up and the topic can change quickly.
If we do end up submitting the revised paper, can the journal turn it down at a later date on the basis that the delays have been too long? Do journals usually have explicit rules with regards to delays for re-submitting after reviews?