Found a website that may help you…
add the value to QAUDLVL and see what results after 24 hours. Since journal management for QAUDJRN ought to be configured for automatic handling by i5/OS and you should be saving your receivers regularly (daily?), the volume shouldn’t be a concern.
After 24 hours, remove *JOBDATA and compare receiver sizes for the previous week.
It’s extremely unlikely that you’d be tight enough on space that 24 hours will make a significant difference. If it does, your system has more serious problems — an error that causes excessive spooled output would be more dangerous to you.