I want to ask someone about the normal/average time she needs to finish a sketch/drawing.
I have several options of question and I feel there should be some corrections to these question sentences. I'm also still confused on how to use "how" and "what" in these questions. Are they both acceptable? Any help would be appreciated.
- How long is the average time you need to finish a sketch?
- What is the average time you need to finish a sketch?
- How long is the average time your sketches take to finish?
- What is the average time your sketches take to finish?