Idk either, but I guess time is a bit wraped there. They are probably at least 100 years in there by now...
Major Spoilers for the Novel
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Time is condensed in the rift. Yohan spends nearly a year in the rift only to emerge and learn that only 2 weeks have passed. LHM has been keeping time using his heartbeat, and he and his team had been in the abyss for over 100 years, so yeah, it's a pretty substatial age gap atp. He's keeping it from Yohan tho because he knows how kind Yohan is and how much Yohan will cry for them when he finds out, and he doesn't want to give our poor sheep any more stress than he already has. TTATT
Why is there smth sus abt the ML? I mean im only at chapter 19, so this might sound far-fetched. And was the ML actually joking when he said that he hadn't seen the team member for thirty yrs? spoilers pls!!!