We've got friends who have four climate-controlled storage units in CT, each is probably about $250/month so they have been spending $12,000/year for the last four years or so. Mostly media (DVDs, CDs, books, etc.).
They are now round tripping from New Hampshire back down to CT each weekend to try to empty/consolidate them, about 5 hours each way. After about 6 months of this, they got ONE emptied. The SAHW is a bit, um, OCD. . . They are really going to try to pick up the pace now, though, and hope to empty another in maybe 4 months.
Oh, by the way, they also have her former parents house in the area, now vacant since both her parents passed away a couple of years ago. So I believe she is paying half the cost of keeping the empty house going, probably totaling another $12,000 by now. I pointed out it would be cheaper to move all the storage unit contents into the local house, or pay to move it up to New Hampshire and rent a larger house, since their current spare bedroom is full, unsurprisingly. The problem is that then the stuff would be so overwhelming it would never get cleaned out.
Given that it took 2 years for her to move up to NH for the new job, I don't see them finishing this in under that. . .