No, I doubt there is a limit — but if there is it’s a few magnitudes over 3000.
The subsystem this jobq is attached to has two entries that you should be concerned with
1. Operational attribmute .. Maximum jobs in subsystem . . . . . . : *NOMAX
2. JobQ entries
Seq Job Max
Nbr Queue Library Active
10 QBATCH QGPL 1
If these are both *nomax you could have alot of jobs attempting to run at one time.
If the jobs are essentially doing the same thing – alot of contention for resourses.