I was trying to find out if there was any info about how long each series was in universe (as it were). So we know the first series starts in 2060 because someone (Virgil, I think) explicitly states it in one of the opening episodes. That puts series one episode Breakdown August 15th 2060.
Jeff's accident is described as "8 years ago" in mid series three. But beyond that I'm not sure if there is much discussed that alludes to how much time has passed.
Is there any further information about the in universe timeline or is it all speculation? It feels realistic to assume that each series would be at least six months if not a year. Though I also wouldn't be surprised if they directly followed on from each other because TAG seems to imply the IR boys are impossibly busy (Gordon says the record is 51 hours without a mission) then it might just be possible for all three series to be set within twelve months or so start to finish.
Apologies if this info is in a really obvious place, I could find it when searching.