We have always picked our puppies up at or around 8 weeks - some a couple of days early, some a couple of days late.
Suki was the exception because she was a rescue pup. She had been dumped at 2 weeks with her mum at a rescue centre and so from 2 - 10 weeks all she had known was the kennel and run. She was totally unsocialised and absolutely terrified of everything. She had no idea what a house was, let alone grass and washing machines, doors and vacuum cleaners. Everything scared her.
It took a lot longer to socialise her because she was so scared, but we managed it. She was always highly strung but that was partly due to her breed (she was a saluki cross)
I think having only had Maximus 4 weeks now (is it really that long already???) that 8 weeks was right in his case. It took a few days for him to settle and turn into a cockerdile (!!!) but now he is doing brilliantly. In fact, at puppy class last night I used him as the demo dog to show what can be done with a 12 week old puppy! He was really, really good. He is learning new things every day. Sleeps through the night and is clean and dry. House training is a work in progress but as long as I keep a really close eye on him, he does give signals and does most of his business in the garden now. He is a happy, lively, inquisitive pup who loves nothing more than being with us and the other dogs.
Good luck and really hope you get a new puppy soon so we can compare notes <3