"How long is the wait before I get MY left seat?"
It is not YOUR seat. Command is NOT an entitlement. It is something you get when and IF you fulfill all the requirements that go along with it.
The command selection procedure and command course here in QR is no picnic. Not all F/Os that fulfill the requirements get selected, but the ones that do, and pass the course, have worked very hard to get the left seat.
A command requires experience, maturity and attitude. Humility also helps. Let that be your starting point instead of dreaming of fancy cars.