According to my math he has 48hrs.
8 games left
2 week roster exemption
6 games rostered to accrue a season.
Seeing reports saying Nov 13, but they don't make sense.
Roster exemption has nothing to do with him being under contract. He is under contract the day he inks. He has to do so by the 13th.
Once inked, the team has the option of asking for a roster exemption thus giving them time to make appropriate moves to get him on the 53. But he is still under contract and available to the team.