Instantly
Earned how to tree walk, water walk.
Instantly learned how to summon Katsuyu perfectly.
Instantly learn how to use remote healing.
Instantly learned regeneration.
No help, no practice,
Her chakra reserves were the smallest and her control exceptional so it was quite easy for her to walk up a tree. We never got her water walking exercises training so don't make assumptions.
Another assumption, you don't think that Tsunade taught her how to summon in the two and a half year gap? Also her great chakra control would make it simpler than in Naruto's case for the training. He was also younger than her.
An assumption, we never saw the training.
Well, Tsunade showed her the mechanics of the Byakugou obviously, though that is irrelevant. When it's active it auto heals the user, no real effort required on Sakura's part.
She did have help though, everyone did. She wouldn't know anything if she never received instructions (help) on how to do something.