You have the teaser scene, then the 4 acts that follow for hour long drama. I hear there can also be 6 acts, but when I write hour long, I stick to how I'd end each segment before commercial, so the next act would pick up after the commercial. One page of script= 1 minute of time, usually. Still, it depends on what is shot, how fast it's shot, how it's edited, et.
For hour long, 10 to 11 or 12 pages per act. Maybe 5 or 6 scenes per act as well, maybe more, if there are very short scenes as well.
50, 60 pages or so. Still, stuff would probably be edited down or out to bring the finished product to enough screentime for the hour.
I never write in 6 acts post-teaser scene, as there are NOT 6 commercial breaks, so it gets confusing.
For half hour sitcoms there is a cold opening, then act 1 and act 2 and a tag scene. Pretty much nowadays I think that's how it is. Over the years it was all over the place. Some shows would not go to a commercial break before the tag, some would, et. Not sure if it's the same way on all sitcoms now. I do know there is ONE commercial break between the first act of several scenes post-cold opening, and then the 2nd batch of scenes.
On soaps of the 80s, they had 4 acts only (unless they wrote in 6), I think. They showed what happened in the previous episode, then the opening credits, then just went right into act 1. No teaser scenes like 90210/Melrose Place did as those shows went on.
I touch upon the 6 act because I've seen posts on how shows do that nowadays that are hour long, but it would get confusing to me to write it in 6 as I'd rather just end the act where the commercial would go (4 acts). I know I saw a sample of Melrose Place 2nd episode of season 4 online script and it was in 4 acts, I believe. A teaser and 4 acts, BUT, I believe one or two of the scenes that ended segments before commercials were NOT how it was finalized, they used different scenes, possibly due to editing/timing.