I wouldn't know about your printer, but I learned a long time ago that my Epsons clogged much sooner if left 'naked' without covers.
I was recently reminded again about this when I left the cover off a machine for a week for some reason, and when I did my usual QTR Calibration printout to exercise the nozzles, I noticed the yellow looked faint. A nozzle check proved that about half the yellow nozzles were clogged.
I would guess that your local average humidity and usage habits play a big role in this. I print in spurts. Might go a couple of weeks between prints, so exercise the machine twice weekly with the printout on plain paper and nozzle check to maintain both my printers in good working order. (R2000 and P800) Oh yeah, I also keep a coffee mug of water under the cover of the P800.
YMMV.
bob snow