Per sqm I guess?
Most of the seed banks/breeders will say 500-600 per sqm
But if you want it done in 10 weeks I'd pick 1 that claims to finish in 8 weeks. They tend to be generous on timescales.
I had a WhiteWidow that was a 8week Finnish from RQS. That was my first ever grow and had 3 plant and pulled about 50g per plant dry.
I had 3 strains and 3 of each in a 1m x 1m x 2m tent and pulled about 350g dry with a 400whps. So I was happy as a first grow.
Don't really worry about how much anymore tbh.
Atb mate