I really want to start commuting but I'm looking at a 20 miles each way (12 miles rail-to-trail crushed granite & 8 miles decent low traffic road) all with little elevation change. Am I crazy?

I'm also thinking about other options, like drive in, ride home, ride in, drive home.

I think I've work out all the logistics on the work end, secure place for the bike, access to shower, etc.

I've just been reading these posts for a while and it seems to me most are commuting under 10 miles each way, so I am second guessing myself.