What is an acceptable time for child in garden on trampoline on a Sunday morning?

[Screechingonthekidsshows]

Just this ⬆️

Definitely not earlier than 10 am on a Sunday, for a lot of people Sat/Sun is the only lie in people get now due to long week time commutes. I would speak to the neighbours about this sooner rather than later.
Otherwise blare classical music at their bedtime!

10 is way too late!

I'd be up at 11.30 at night, but I would do my best not to make noise at that time that will disturb my neighbours because I have enough awareness that many people will be trying to sleep at that time.

It is about consideration for other people around you.