Heltor Chasca
Out-riding the Black Dog
It's not for everyone, but not everyone can spend 2-4 hours on the bike outside 3 or more times a week. Indoor riding tends to be quite intense though so 1-2 hours a time, 3 to 5 times a week will be a heavy work load if used properly. If you are into racing Zwift is the one to go to apparently.
Indoor training has been a revelation to me. I have always hated gym related exercise. But as a busy, single dad in a full time job, my smart trainer has been amazing. I do mid volume plans of about 4.5 hours a week which equates roughly to 9-10 hours outdoor training. I can get a session done whilst still helping with homework, catching up with the kids etc.