I'm not commuting (yet) but went from 2.77 mi to 10.8 mi rides in about a month with 10 days off in there as I replaced my front brakes. This is from not riding at all for more than 10 years. Looks like I'm settling into about 3-4 rides a week as I get used to riding, traffic, etc. I've got 20 years on you so you should be able to get it done faster I'd think.