Some people's responses really confuse me.
I have neighbours both sides,. Semi detached but joining gardens, and neighbours that back on to my garden.
I couldn't tell you what time any of them do any garden work.
Apart from Dave, he's out with the dawn chorus all day bless his soul.
But we never hear them, or them us .
In six years of living hear, yesterday was the first time we heard the neighbors at the back (and wow that annoyed my youngest)
Even the scummy neighbours to the left, we only hear them when they're having an alcohol fueled argument in the garden and we're in the kitchen/playroom.
General living noises, we never hear. It's so odd.
That being said, I'd say 930a.m.