There are a lot of misconceptions about crate training. I am by no means an expert, AT ALL, but I do know a bit about it (as I'm attempting to crate train my puppy). A dog can hold it's bladder for about how many months old it is. So your Chewie
could potentially hold his bladder for 7 hours in an absolute emergency. Of course this is a general rule of thumb, there's a lot of variation.
When you crate train a dog there are a few basic concepts. First, you put the dog in a crate that is big enough ONLY for the dog to be able to make a small circle. The theory is that if the crate is the right size and small enough the dog won't eliminate where it rests. Even for people that crate train and do it exactly as you should (all the time) may experience times that their dog simply could not hold it and they will eliminate in their crate. Continuously eliminating in the crate will negate the positive reinforcement and learning the dog has learned from the crate training. (Think of puppy mill or pet shop puppies, they make in their spaces without thought so much that they are VERY difficult to house train/crate train because of this. If a behavior is reinforced, even if you do this wouldn't trying to, it will continue!)
Second, you ONLY leave the dog in their crate for lengths of time that are appropriate for them to hold their bladder. As I said, times can vary between dogs. But for instance, if you leave a 3 month old puppy in their crate for 4 or 5 hours you've just set your dog up for failure. While Chewie is older, he clearly hasn't figured it all out yet, so long lengths of time in the crate may just not be appropriate for him yet. Generally you make it a slow progression, an hour then two then three, etc.
While I understand that there are situations you can't control, sometimes we have to compromise or make the best out of what we're given to work with. For example, my 4 month old has to stay at home alone when I go to school. While my boyfriend usually leaves a few hours after me, giving her a few hours reprieve, she will have to be confined once she's home alone. For any length of time ABOVE 2-3 hours I put her in her X-pen. The point of the X-pen is to give her room, to play, to stretch, to eat, and to eliminate if necessary. Some people put puppy pads in their X-pens, knowing that their dog will eliminate and with the goal to have the dog eliminate in the appropriate spot. You don't have to buy and X-pen, you can find a safe space for Chewie to stay (usually Laundry rooms, bathrooms, or kitchens work best). But even a dog that's FULLY house trained probably couldn't last 10 hours without leaving you some kind of present. There are days I've had no choice, she's been home alone for something around 5 hours, and I know that leaving her that long it's not expected for to have NOT had an accident, but I just clean it up and continue to reinforce when she makes outside.
Also, on leaving water in the crate, for Chewie being alone for 10 hours it would be cruel to not leave him water. In fact you may want to leave him a little bit of food too. All the same, if he took even one sip and filled his bladder, how is he supposed to hold it in? Think of you really having to go, and how hard it is to wait and hold it for long periods. You have that control and you've practiced a lot. Imagine little Chewie, his bladder's smaller and he's had WAY less practice!
There's a LOT of information out there, be it here on YT or books or whatnot. My best suggestion would be to figure out what you may be able to do to work around Chewies needs. If you can't come home then you can't, don't beat yourself up any more. But you could think about other options then. Finding a dog walker to come during the day when you can't. Think about putting Chewie in a larger space. Think about training him to go on puppy pads while you're gone. There's a bunch of different ideas, those are just a few.
I hope that was of some help! Best of luck!!!!
