I used to be on the old puppy threads, but my youngest is now 19 months old. So I read this thread but don't usually comment any more.
However, just wanted to say @RaptorShark I am glad you clarified your post, because I did think it was madness to walk a 4 month old puppy for three hours a day.
FWIW, I read the current thinking is 5 minutes of walking + 5 minutes of sniffing per month. So at 4 months, we were doing 40 minutes of slow wandering through the woods. It was all off lead and very much at puppy's pace, rather than me striding along and her having to keep up. And we did this two or three times a day.
By 6 months, we were up to an hour long walk and we stuck at that until she was a year old. I didn't rigidly time the walks, so we might have sometimes been a little over or under. I find you get to know how long certain routes take you.
If I had done on lead pavement walks, I would have stuck to the old 5 minutes per month rule, as that type of walk is harder on the puppy's joints.
@FoxandDuck We had a coffee wood stick. My eldest buried it in the garden a few years ago. My youngest recently found it and chewed it in the kitchen. Bits broke off everywhere. I don't know if it's because it has been outside for ages or not. We didn't have it for long enough to test it out when it was new. You probably don't leave her with it unsupervised, but I thought I'd mention it anyway.
ETA - apologies for gate crashing. I shall bugger off back to the adult dog thread now. 🙈😂