It takes about 20 minutes of run time until you get the notion it was a solid idea. This is how I look at it. Regardless (Irregardless...I never saw the use of this word until I ran with a small posse of folks 25 years ago who preferred this word...it must have been in their lexicon) if I know this the battle still persists in getting out the door. For me the 20 minutes is huge, because most days if I get that far I can run 10 additional minutes and head back to the barn. This is the crux of my whole training plan.
If I wish to start running more per week I have to trick myself into believing I can go an additional 10 minutes out (sometimes more) before turning. I do a lot of out and backs during the week because for me when I get home it seems like the run is far greater than half over. It doesn't make sense, but this works for me.
I take one day a week off now, but I would like to get back to 1-2 days off a month and ultimately add a few evening runs. The motivation is I don't necessarily enjoy taking the dog much on these runs in the dark, but at the same time I am the main source of her regiment in the cooler conditions. In the winter it would still be dark in the evening, but I could run the sidewalks in the neighborhood.
Weekends are a different story. I rarely do 2 hours+ until January or February. There tends to be more people training long on weekends at this point and I just hitch along and get the time in. Every year seems a bit different for weekends, but essentially the heart of training for me is what I can get myself to do during the week.