We have a 60" in the living room that we bought when we moved in (almost 3 yrs ago).
It's visible from the entire upstairs. Living room, kitchen, dining room, pool table...
We could go a little larger, but it's fine for us.
I get up in the morning and first thing I do is turn the TV on. And it stays on until we go to bed. Even if we leave the house.
We have a 42", 10yr old tube TV in the bedroom that is only on for 15-30mins when we go to bed.
The spare room has an even older 37" that isn't even hooked to the dish...
I haven't been in that room for a few months.