Weekdays I don't get home from work until between 5:30 and 6:00, if things go smoothly. I have to let the dog out to pee, do my routine of the glucose testing and injection of Gila Monster spit, and get out of the work clothes. I try to get on the bike at 6:00, but in general it ends up being a little later, and I'm essentially off the bike by 7:00 or close to it. Then I sit down for a minute to rest and stop sweating, get up and feed the pets, and put on some sort of dry clothes. Figure by then it's about 7:30.
The time between 7:30 and dark is not all that long, and it's getting shorter. And really, any power tool use after 9:00 is pretty annoying to the neighbors. And if you look at set-up and cleanup times, there's precious little time to get any actual work done.
I'm not giving up riding the bike. That's been the single best thing that I've done since I've started it, and it's staying. I'll even likely be expanding the workout so it will take longer. I've thought about shifting the time to later, but I'm afraid that will make it far too easy to blow it off from being too tired or it being too late.
I think I may have to give up on exterior work during weekdays, and concentrate on the interior stuff-- leave the exterior for weekends. Or at least weekends where it doesn't rain.