Trying to put time limits on potty training puppies is an exercise in frustration. They will learn when they learn. Every one is different. Consistency, confinement and close supervision WILL get you there, but no one can predict exactly how long it will take. Kodi took the longest of my three, probably mostly because he was my first, and I didn't confine/supervise as closely as I did with the younger ones. Pixel seemed to practically train herself. It was so easy, I honestly don't remember how long it took. Panda took longer than Pixel because she had two UTI's that made her need to pee CONSTANTLY, and then made her want to avoid the litter box for a while. But they ALL "got it" eventually.
Panda was two yesterday, and although I don't have to go down onto the grass with her, I STILL have to make sure she actually goes off the deck in the morning.
She does't have accidents in the house, but if I did't insist that she go off the deck, one of these things COULD happen:
She could pee on the deck. (which I don't want her to start doing)
She could be asking to go out 10 minutes later. (because I KNOW she has to go!)
Or I suppose it's POSSIBLE that she could have an accident in the house. (though that is unlikely since she also has a litter box available)
In any case, I don't want ANY of those things going on. I'm not the door man. They need to go out and potty before they get breakfast. End of story. She WILL eventually learn that rule, but as of now, she still needs to be prompted with an extra "Off the deck!" cue after the other two have headed down.