My weekend pattern is to watch an episode with breakfast, do some chore like clean the litter boxes, watch another episode, run an errand, watch another episode, rinse, lather, repeat. It helps me get through housework that would otherwise be overwhelming by breaking it into segments and providing a reward. Weeknights I might watch 2 or 3 episodes while doing stuff online.
I will marathon shows I've already seen and new ones. The new ones are almost always short run British shows although, as I think I said above, I will also save up the last few episodes before a series finale in order to