That's not a bad start - averaging 6.5 miles a day, and I think my average will continue to climb (now I'm biking in every weekday, that's almost 12 miles a day, plus weekends I've been trying to take at least one longer ride - on Sunday I put in 15-20 miles, for instance).
My goal is to get past 1000 miles by the end of the Summer - whenever that is. 200 miles a month won't get me there, but if I can make that closer to 300 I should be good.
Oh, and I've signed up for the NYC Century ride which is coming up in September - I doubt if I'll finish the full 100 miles, but I'm going to do as much as I can (and next year I absolutely want to do the full 100).
(Update: ok, so the equinox is September 23, so I've got just shy of three months - if I can average 300 miles a month - or if you prefer 10 miles a day - for the rest of the summer, I'll make it. The weekend of the Century ought to do a good job of padding the numbers. ;) )