I've not been keeping a running tally, but I usually average a minimum of ~25 miles a week so... at least 300 miles. Maybe as many as 400, or around there anyway. No clue as to elevation change, though.
Not all of them are unique or at all strenuous, either. I tend to run through Perl Charles 1A (with different loops taken occasionally) 1-2 times a week as an afternoon stroll, because it's close, easy, and acceptable for me' dog. And I do a new medium/long (10-25 mile) hike once every weekend, and usually something easy on whichever weekend day I don't do that (lookout mountain, over and back again, is popular with me, again for the proximity and ease). So 10 + (10-25) + ~4 gives me 24-39 miles, I guess.
On any given break from school my weekly hiking average usually doubles.
Hoping to get a yearly total of ~1500 mi under my belt by the year's end. Maybe more if I take to trail-running seriously.