When I reload, I usually reload in lots of 20, 50, or 100 depending upon the caliber and my needs for ammo. In the past month, I have found myself doing different stages of my lots over longer periods of time ... for a week as an example. I tumble the brass, deprime and resize, trim if necessary, deburr/chamfer if necessary, and then prime the cases. It is after the "priming the cases" step is where I might choose to stop. Is it a problem to let primed cases sit in a reloading tray for an extended period of time? I didn't know for sure if this is unsafe or if primers can draw moisture from the air making them ineffective or less effective.
I try to always complete the reloading process when I start but I am finding it harder to do with all I have going on right now with work, etc. I have made a conscious effort to not stop at this point in the process but it seems unavoidable at times.