So i just switched up my routine, im currently on a 2 day split (work each body part twice a week), very standard, nothing out of the ordinary, but i do have a few questions concerning the "train each body part twice a week method":

1- My sorness from previous workouts rarely subsides in time to when i do the same muscle group. Is this a concern?

2- I cant lift as much, as my muscles tire more quickly. Is this a muscle building concern?

3- My workouts consequently last longer compared to before, last about 1h 15 min-1h 30 min, is this a problem?

I was previously on a routine training one body part per week, but my progress was not going to well as my muscles were not getting enough required stimulus to grow. Strenght gains would never be prominent because one week is quite alot and getting caught in a rut is quite obvious.

Any type of KNOWLEDGABLE comments would be appreciated considering that i am hoping on busting through a muscle plateau and further augment my gains/ muscle size!
Thank you!