Hi,

There is no limit in the no of collaborators in the odoo sh projects, you can add N number of collaborators to it, as per you need.

Worker in Odoo is a parameter which is related with the performance of the system.

Thanks

Hеllo! In Odoo.sh, thе numbеr of collaborators for a projеct dеpеnds on your subscription plan. Thе frее plan allows up to 2 collaborators, whilе thе paid plans offеr morе flеxibility, typically starting with 5 collaborators. If you nееd morе than that, additional collaborators might comе with еxtra costs, so it's good to chеck your subscription dеtails.

Rеgarding push accеss to production and staging, you can control that on a pеr-usеr basis. So, in your casе, with 5 tеam mеmbеrs, you can grant push accеss to production and staging for thе spеcific 2 individuals who nееd it.

Workers enable multiprocessing for your Odoo instance. 1 worker ~= 6 concurrent users.
As Niyas Raphy pointed it is not related to limit of collaborators in odoo sh.

More info here:
https://www.odoo.com/documentation/16.0/administration/install/deploy.html#builtin-server