REcharging I am quite sure nobody can scream for 90 minutes - the OP read as loud singing (not screeching but audible from next door) for 85+ minutes, and maybe the screamy volume and pitch for the last couple.
STG as mother of 3 under 10s I absolutely agree children can be irritating little ... creatures with no volume switch, and that other reasonable adults in the neighbourhood are within their rights to ask them to tone it down and expect that to happen - but an adult would never ask another adult to leave their garden or stop singing all together, and I do very firmly believe children deserve the same respect, when they are on their own property.
Its not just your sweary and antisocial adults who can be just as invasive with their noise etc. as children though - even naice people have non shouty sweary parties which are ever so civilized but still lpretty loud and enough to keep children awake (and why should the children's bedroom windows be shut on a stuffy, hot summer's night any more than the adults next door at 8am the next morning). If adult neighbours are having a party in their garden at 10pm with singing and laughing and other noise which keeps my kids awake - nut not pumping loud window shaking music which breaks noise pollution guidelines nor shouting and swearing, I know I would be U to complain and society would absolutely expect me to suck up the disrupted evening due to constantly trying to settle over tired kids, and the knock on effect the next day - all rather more of a negative impact than loud kids at 8am have on an adult.
I do not think children can do no wrong, and do think they should be encouraged and expected to be as considerate as anyone else - but do not agree that their natural schedules (8am is a reasonable time to be in the garden, 10pm ridiculously late) are less valid than an adults wish to have a lie in and a civilized garden party til 11pm.
I absolutely know the OP hasn't mentioned garden parties btw... it is just an example of how adult noise which is invasive and disruptive has to be far more extreme or even illegal before we feel we are R to complain about it, and it is not really clear why children are fair game and disapproved of at a far less extreme point on the silence to noise pollution scale.