(Disclaimer: speaking in general terms, not necessarily from experience)
First off, a pedantic note: because hands happen faster online, win rates tend to be expressed per hundred hands rather than per hour.
The one big bet an hour rate comes from live games where the players might only be seeing 20 or so hands an hour. So that works out to 4-5BB/100 hands and if you can sustain that online, you'll be doing very well.
If you're a very good player you might be able to take micro stakes for a bit more than that because they play will, in general, be of a worse standard, but I wouldn't expect it'd be a quantum leap bigger or anything.