Originally Posted by Check Essential

Need more information to answer your question. Its a bit convoluted.
The answer is yes they can give you a 9:01 layover if it meets the rest requirements for all the surrounding flight duty periods and the contractual break in duty requirements. Keep in mind that deadhead only periods are not flight duty periods but deadhead segments occurring at the beginning or middle of the period are part of the FDP. When they are at the end of the FDP then they are not.

You do realize that if a reroute causes your next trip to "not work" because of 117 rest issues, then you are pay protected. That would normally be considered a good deal. Let them take your 30 hour break.
You might have recovery obligations though. It depends. We would need a lot more detail to give you the answer you are looking for I think.