After issiung non bailable warrant

1)is it compulsory for all 4 of them to appear together because next time these

3 might come and the one who had appeared in the court might not come.?

Opinion: yes it is possible, lawyer of the accused who was appear before the court can file an exemption application on behalf of him.

2) what if any partner does not appear even after issuing non bailable warrant?

Opinion: It's dpend on you if you want further proceeding then you can approach to court to start proceeding of Proclamation or attachment u/s 82 & 83 of Cr.PC

3) How long will these case take to get the judgement .Since we always get dates with in a gap of 2-3 months?

Opinion: in practicle there is no time limit for dispossed off the cases in Indian Court due to pandancy.

4) What would be the scenario if they get convicted ,i mean what is the penalty?