I haven't seen my brother much over the last year for obvious reasons. Every few months we catch up over the phone. He usually rings me because he works whereas I'm a SAHM, so it's just easier for him to catch me at a good time rather than the other way around.
We're usually on the phone for 1-1.5 hours. The last couple of times he's called at 9pm. We both have young children (both have 1 & 3 year olds) so both have broken nights and early mornings. 10-10:30pm is waaaayyy too late for me to still be on the phone by the time I switch off and get to sleep as I am usually disturbed by the 1 year old around 1am and woken by the 3 year old any time from 5am. His kids are worse sleepers than mine.
This got me thinking, what time is it too late to call someone when you know it's going to be a fairly lengthy chat? Even without the kids/disrupted sleep situation I wouldn't like to be on the phone that late, but I have always been an early to bed, early to rise type so I may be in the minority.
YANBU - 9pm is too late to call when you know the call is likely to be 1 hour plus.
YABU - stop being an old lady and speak to your brother at what is a perfectly acceptable time of day.