Chief Mate Seatime

Good afternoon-
I’m was curious if anyone had any knowledge on how the NMC keeps track of sea time to settle a debate with a friend. If someone ends up getting off their current ship as 2/m unlimited a day or two short of the year required for CM UNLT, but they have more than enough total days because when they upgraded to 2/m they had excess days on their 3/m license, would that likely be a hold up at the NMC, or do they generally look for the total sea time from your sea time letter? I would assume it’s a 50/50 chance they’re approved to test.