how many letters do I need?

I'm asking around for people to write recommendation letters. How many letters do I need? I'm thinking to submit 8 letters. Is this a good number?

240 citations
7 papers
8 reviews
field: electrical engineering
category: EB1A

BTW, do lawyers help write recommendation letters? Or we have to write them ourselves?

to goldengorilla158:

I submitted 6. My lawyer wrote everything for me, but it might depend

to goldengorilla158:

I submitted 5 letters but yeah it probably depends on the case