My husband finished mid May and I've been pleasantly surprised at how he is coming along at this point.
While there are on going issues like not eating as much as he used to he is putting weight on. His energy is lower but he is working, gardening, doing some wood working and walking the dogs every day. His concentration is much better as his is mood.
So, while there is certainly more stuff we want to see improve and everyone is different I don't think you'll have to wait a year to see improvement.
The first month after treatment sucked and after that I could literally start to see the improvements in him!!!