Hearing loss Temporary or more permanent?

Hi there So I got my system reasonably dialed enough to impress most folks (Which isnt saying much) I happen to have my system with my computer in the center for use as a media server and have my speakers just about a meter in front of me while I am at the computer and about 3 Meters at my Listening seat and am curious. I have been playing my music louder and louder lately and am noticing a temporary hearing loss that comes right back (Very minimal but I can feel it in my ears) I have done this before but my system has never sounded THIS clean and am now holding back to make certain I preserve one my most important sense aside from the all important Spider Sense

At what point and for how long playing music at not exeptionally loud (Nothing compared to the horrible car sytems I endured being stuck in for long times as a teenager) Any way its a valid question as I really want to preserve my hearing and I really want to rock out. I can go get A DB Meter if that helps. Thanks a million Toby