Hi,
I was almost identical to your husband. I was immediately dry overnight yet inconsistently wet during the day. It started to settle down about 3 months after the op and by 6/7 months I had complete control during the day.
My CNS stated on average it took most men about 6 months to be continent. However, on here I've seen a huge variation. Some seem to be dry within a week or two and others struggle for years.
I hope he recovers soon, I shared his frustration.