The recovery time varies from person to person. There's the physical soreness, and then there's the mental fuzziness, and they can heal at different paces. My very first seizures took me quite a while to recover from because I was dealing with a very sore back and mouth, as well as adjusting to being medicated. It probably took me a few months to adjust. Other seizures I bounced back from in a day or so. My most recent one (almost three years ago) I got dehydrated and that seemed to make everything worse. I recovered in a week or so physically, but it took a month before I felt myself mentally.
If your husband's sleepy, let him sleep, but make sure he's getting enough to eat and drink. Some of the AEDs can suppress appetite, so you might have to be persistent. If your husband's mouth is sore, stick to soft, mild, non-acid foods until it heals. I remember hard-boiled eggs worked for me -- they seemed to be an easy way to get some protein in. And watermelon was great.
If his back is sore, then he may want to take some over-the-counter painkiller (assuming that's okay with his docs). I found ibuprofen helped for me, as well as a session of ultrasound from a physical therapist. The therapist also gave me a set of exercises and moves to avoid hurting my back and to help it heal.
Assuming he's on meds, help him keep track of when to take them, and also pay attention to any side effects. I was put on way too high a dose the first time, and it took me a while to figure out that what I thought were post-seizure problems were actually symptoms of being over-medicated. Check with his docs if anything seems questionable about his behavior, or if he doesn't seem to be making progress.
You might also keep a journal of what's been going on. There will probably be a big blank spot in his memory, and it will help to have something to read later that will fill in the missing details.
It must be such a relief to have him home. I hope you both recover swiftly.