Actually I can explain from experience that any amount you travel back amounts as the same traveled forward, so you still run the risk of losing villagers, but I think weeds and such are less likely to appear, but I have the beautiful ordinance and I've never tted that far bad so idk. Also, Isabelle and the villagers treat you as if you never left but the farthest I travel at once is 12 days so that may be different too. Good luck!
It will count as one day, but coming back to the present will count as months. You need to stop somebody from moving when you're back in the past if you're planning to come to the present in one jump. You will lose your flowers if you don't have the beautiful ordinance, you will have bedhead, and your friendships will be lowered.
That's weird, when someone asks me to move and tells me when I can tt back to the same amount of time and they'll put themselves in boxes as if I went forward. Oh well, nevermind me. >v>"