It all depends on how your subsystems and JOBQ’s are set up. Do a WRKSBSD and take option 1 to see if maxjobs is set to *NOMAX. Then check to see if the JOBQ is single threaded or can have multiple jobs active at the same time (option 6). Depending on what the job does, it may pose problems like record locks if run concurrently or if update and deletions are being done, throw your files out of sync.
If you are looking to run some simple reporting jobs you may be fine. Just be aware of the possible issues if the data is changing in the job.