Since neighbours, passers-by or even animals are at the mercy of the noise pollution caused by leaf vacuum cleaners and blowers, there are recommendations on the use of these devices. This includes, among other things, a local and/or time-limited ban on the use of these implements. The times that environmental health officers recommend are as follows:
on weekdays (Monday to Friday): from 8am to 6pm
on Saturdays: from 8am to 1pm
on Sundays and public holidays: don't use leaf vacuum cleaners and leaf blowers
These recommendations are for the UK. If you don't know what the operating hours in your home country are, you should check with your local government.
Also take in consideration that it is illegal to blow leaves from a private ground to a public ground.