That's fair enough and as both you and @Commentator say, Installation shouldn't normally take much longer than a normal meeting, depending on how much faffing around takes place. I've visited lodges during their installation meetings and some of them really do like to drag it out, unnecessarily so.My Mother Lodge and others I visited managed Installation in a meeting that was no more than 20 minutes or so longer than an Initiation. When I went to the local one there were huge sections of ritual that I'd never seen. Great chunks of reading rules and by laws. Then at Festive Board, the DPGM droned on for 35, yes 35 minutes. It was like pulling teeth. I was driving so had no reason to stay and came very close to just standing up and leaving. I wasn't the only one.
I've also experienced the provincial rep who likes the sound of his own voice and drones on and on. Fair enough they have a responsibility to read out the parish notice but the wisest of them keep it short and sweet.
In fact, I had an occasion when the prov rep went on for a similar amount of time. As SW my turn came next and I just stood up and said "those of you who know me know I don't like to go on so I'd like to propose the next toast to the Worshipful Master" and sat straight back down - point made.