I'm more curious about if with Skylar's trip to the past if somehow how much times passes between future / past got changed. As from what I recall the first time the MC went to the past and came back to the present the same amount of time went by. Skylar would need more than a week in the past for 2 sets of sleeves to heal unless that is future Skylar maybe.
That is the case yes MC was "missing" for a bit in the present and your family/darci freaked out about it the same thing happened the second time he went but it was done quickly enough that nobody noticed he was "missing". Regardless of Skylar spending time in the past or being from the future she proves there is more time travel than the "go back exactly 20 years" that MC has done.
Skylar's tattoos are unironically the smoking gun that will solve time travel 
I think a lot of people forgot that when mc went to 1999 the time he spent in the past the same time past in the "real" world. Unless Jestur changed the rules of time travel for his game then it was the for days. If I'm wrong I'm wrong, but this is info straight from the game.
MC got sent back by the mystery man, who had total control over the time portal. He probably could send him back at any time he chose. There might be some rule about sending back after the same time in the other period to conserve energy or to prevent the traveler from aging more or less than they should. Skylar may have been captured by the competitors who have a less refined time machine that is not as predictable as to when the return happens with possible negative effects.
Not forgetting at all. But we already know, from facts within the game, that the rules are not constant (tries to save his aunt...fails. Give Scarlet the necklace back...Krsytal's name changes). So right away, we do know the rules presented by Jestur (so far) can be different depending on what is being changed.
You are correct both times MC goes to 1999 time passes the first time he is there for over a day (over night) and people in 2019 are worried because they could not find nor reach him the entire time he was in 1999; the 2nd time he is told by the mystery coughing person to get it done quickly. The coughing person even mentions that time passes the same in both places iirc
There are for sure rules that we the player dont know yet; Have their been any hints that any other group has any ability to time travel? If she was taken why was she able to get tats she clearly likes? (she makes no attempt to hide them which implies she wants them to be seen/got them of her own volition).
the tats would not age 20 years unless the skin they were on aged 20 years.......and skylar is not looking 40
Logical assumption yes, but never assume. Very dangerous. You're assuming you know how all this works. We already know we don't. As for what should and shouldnt be, well, time travel shouldn't be either should it...but it's part of this VN's world, so you can't just dismiss something because it doesn't fit your world logic view.the tats would not age 20 years unless the skin they were on aged 20 years.......and skylar is not looking 40
The exact point I was trying to make to Simp above. We don't know the rules of the universe....so at this point, anything is possible until contradicted or factually proven within the world.
