Just straight and honest answers,is this enough?

Hi.
I am a physical person more of a field person/Or 70% in person 30% academic
I am in my second year in A STEM subject (Bachelors Degee) part time.
Right now I am studying 15 hours per week including lectures.
I am trying to reach 20 hours-25 hours a week of studying.
Is this enough? A lot? Respectable?
Thankyou.

A typical approach is that studying on a full-time degree programme should be treated like a full-time job -- i.e. you'd expect it to take 35-40 hours a week. That might be variable; some weeks you might do less, but at busy times you might do more.
For a part-time course that would vary accordingly. If you're studying at 50% intensity (compared to what a full-time student on that programme would be doing) then you'd expect to do 17.5-20 hours a week.

A typical approach is that studying on a full-time degree programme should be treated like a full-time job -- i.e. you'd expect it to take 35-40 hours a week. That might be variable; some weeks you might do less, but at busy times you might do more.
For a part-time course that would vary accordingly. If you're studying at 50% intensity (compared to what a full-time student on that programme would be doing) then you'd expect to do 17.5-20 hours a week.