Crothian said:
Do they air reruns during the other times over there?
Well, taking Buffy as an example.
Season 6 didn't start here until January (on cable/satellite). Once it started, though, it's been a case of one episode every Thursday night at 8pm, followed immediately by Angel (used to be perfect when the two shows used to cross over from time to time). Both series run from start to finish, one episode a week, until the season ends. That pretty much happens with everything (both domestic stuff and US imported stuff).
Sticking to the Buffy example, each show is reshown on the following Saturday. During the week, an older season is running on some other channel (I don't know which season) - same sort of thing, one a week.
With US imported stuff, often reruns happen daily in order. A while back, the entire Buffy series from seasons 1-5 was shown on BBC2 at 6pm every day. Same with Friends - Thursday nights is the new episode every week (repeated on Sunday), while older seasons are shown daily in order earlier in the evening.
I don't know how it works out like that, or how the advertising etc. works over here, but that's the result. It obviously works very differently over here to over there, though.