How long can my puppy hold it at night?
Every puppy is different for how long they can hold it overnight. Crates are the very best for helping them overnight. It helps keep your puppy from moving around to much, which helps their bladder still too! Many puppies can hold it the very first night they come home.
However, many puppies can't. The smaller the puppy, the smaller the bladder and the harder it is for them to hold it all night.
I always suggest having the crate near your bed so that you can provide comfort both verbally but also with your hand if needed for the first few nights. If your puppy cries in the night, take him out. Within two weeks, your pup should be holding it all night. This is assuming you are taking him out at a reasonably late hour before bed and a reasonably early hour in the morning!!!
How long can my puppy hold it during the day?
If you are leaving puppy in the crate, again, they aren't moving. So, the average is their age in months plus an hour....this is only up to about 4 months. Anything longer than 4 hours, in my opinion, you are better to leave them in their ex-pen, just so they have more space.
If you have to go to work, your puppy must have someone coming in during the day for at least a pee break if not a walk. It is truly not acceptable to leave a young pup (let alone a grown dog!!) alone all day with zero interaction or relief. Puppies need to learn to hold their bladder and the only way they will learn is with help from someone letting them out at appropriate times. If they continually have accidents in the house, this will continue and they won't learn what is acceptable. Housetraining can be very quick if we are conscientious and consistent!