28 months vs 31 months of ADT is unlikely to make a difference.
Although my case isn't identical to your husband's, the original recommendation for me was 24 months of Lupron. This was changed later on to 18 months, based on a (Canadian) presentation that got a lot of press at an ASTRO mtg (I think). I didn't mind the change at all.
I would highly recommend that your husband gets a DEXA scan in six months as a follow up to the result from 1.5 years ago. And I hope that he will continue to exercise as before. Good job; it should get easier once the effects of the ADT wear off and his testosterone level starts to rise.
PS: My RO did a PSA test 6 months after discontinuation of the ADT. Hence, your husband's schedule may well be the norm.
Dec 2012: GP felt a nodule and hardened prostate; confirmed by urologist
PSA: 11.9 ng/ml
Biopsy (3/1/2013): Gleason 4+5 (enlarged; 45 ml)
Transferred to RO
Casodex 1 month; then Lupron 5/13 through 12/14 (18 months total)
Jul-Sep 2013: SBRT (CyberKnife; 3 x 6.5 Gy) followed by IMRT (25 x 1.8 Gy)
Lowest PSA thereafter: 0.1 (3/20/15)
9/18/15, 3/18 and 9/16/16: PSA = 1.4 ng/ml
Post Edited (Sr Sailor) : 1/20/2017 3:22:26 PM (GMT-7)