here I was wondering if we were taking about OVP inactivity, lol
For me, inactivity is just plain not logging in. I typically post when I log on, and I log on daily, so...
Due to moving: Several months in 2009 (about end of July to September) of actively not logging in, and a month or two at the end of that year due to breaking my wireless receiver. I'd moved to my sister's apartment, and for awhile she didn't have Internet and no wireless receiver on her desktop to mooch off of neighbors. She inherited a laptop for a bit and was able to use that though. Then in October I bought a receiver for my desktop and it was okay until I broke it. Got truly active again January of 2010 when I moved into my new apartment and got a wireless card, something I couldn't break. :p
After that, the summer of 2007. Stayed with my sister that time too, but I was able to log on at least once a week.
Due to boredom: May - September 2004. Joined that May, posted around a day or two, and then only came on when I was bugged to post in the Ash fanclub. Just wasn't interested in PC, I guess. Came back in September when I got bored/mad with SPPf. I haven't been bored with the place since. Yeaaaaah.
Every time I come back, I'm just as active as before, if not a bit more since I missed stuff.