The meaning of "just after 9"

If we have mobile contact and I hear nothing then I'm off after 10 minutes.

Since retirement apart from appointments I don’t have a rigid timetable. If a friend is coming around it’s usually “see you about 9 ish” I’m at home so it doesn’t have to be on the dot.

If my family are coming to visit they give a rough time especially allowing for traffic. When on the way to visit our family we text when about five minutes away so they can get the kettle on.

I remember waiting 40 minutes for someone once. Outside and nowhere to sit. In the dark. Getting a cold. It was busy and I think they hoped I'd give up but I had no energy to go anywhere alone I was 2 hours public transport from home. Every few years for no reason I remember this!!! It

That's what I shall do from now on how many times do people say 'i'll meet u outside?'

A new boyfriend was very late arriving for a meal I'd cooked but I accepted his excuses. 17 years later, I finally realised how wrong I'd been.

I am pretty obsessed with good timekeeping so I tend to always be early for things. As most people I know, DH definitely included, seem not to care about being on time I seem to spend a great deal of wasted time waiting for others to turn up.
I lived in Scotland for 20 years and never could get my head round the expression "back of" as in back of 9 etc. Did they mean 5 past?, 10 past? half past? Seemed like I was always waiting!

A friend was due to pop something round at 3, knowing I was going out at 3.30.

She arrived at 4pm. Luckily daughter was in but said friend then contacted me, to berate me for not being in when she called !