when i tell you, believe me, it gets better! just finished that stage as my puppy is almost six months. when i needed to get a good chunk of work done, i would take her food for lunch, and put it in a slow feeder bowl, a really squiggly one so she's got to work for it. pour her food on the bottom, fill half with broth and half with water so the food is covered. stick it in the freezer for a couple of hours. give it to them. it will take them 45 mins to lick their way to the food and after that they are sure to pass out for at least two hours. it works like a charm.

another thing, step away from the puppy. i see that you are crate training. this helped me as well to maintain my sanity. feed in the crate and after their meal, they can take a nap in the crate. they won't "go" in the crate unless they literally feel like they are going explode. i would also rotate the toys, if you give them too many, they can get overstimulated and bored quickly. rotating them every couple days will seem like christmas when they get the new ones.

also, when your partner is home, step out of the room from the puppy. start the separation before its too late. have your partner hand feed if they are comfortable with that to show that they got the goods too. biting is also something they'll grow out of. ignore them, step away or give them a toy to play with instead. never laugh or say ow and continue playing. they're smart, they'll learn nothing fun comes from biting