How much does Jitsi cost for me as a host with 30 people?

I need experienced Jitsi users. How much would it cost if we wanted to hold a conference for 1-2 hours? In between, however, we will hang up in advance and divide the 30 people into new groups (6-10).

Do I need 6-10 laptops to host these groups?

Do not understand the question.

Is it about Jitsi (if you use a foreign instance such as https://meet.jit.si/ nothing)?

Or 6-10 hardware laptops?