Doesn’t work for me, but then this is where a lot of individual differences start coming into play. I can’t manage those long sessions, either, due to work (although I did back in the day - used to play darts between sets, too). If you’re enjoying your sessions, don’t worry about the time until it becomes an issue for your lifestyle, and if accessory stuff keeps you interested, you can play around with it, although it’s not likely to be much of an X factor, especially if it’s for fun. Since you’re not able to get coaching or a consultation, I’d say your next move would be a form check at this point, and if you decide to make a programming change after that, I would drop weekly volume first and move to a weekly programming cycle. I like four-day split over three days and 5/1 right now. Don’t rip it right out of the book, either - I find I do better with a volume day of three or four sets than five sets of five. You won’t know exactly what works until you try it, especially since you’re doing this on your own.
And by the way, when I do a top set of five, the first rep grinds like Hell. If you think about how slow it is, it will slow you down even more. You have to just commit to the set and then do it.