Chastity and orgasm denial discussion

Hello Esteemed Members. My wife/keyholder has recently decided that I am to have a “milestone” chastity period. Specifically: 90 days, no milkings (she has never done them), and NO unlocking. I am admittedly a bit scared. My previous best was 37 days but that allowed for occasional releases from the device for hygienic reasons and convenience. There was no cumming, but I was able to get fully erect once in a while during those 37 days. I humbly ask fellow members who have endured such a period (at least 90 days with ZERO unlocking or milking or release of any kind) to comment on what to expect. How was the experience mentally? How did it transform from early to later stages? Did you experience any erection issues later? Penile shrinkage? Thank you ALL for your support and interest. David