I just recently went for about 2 weeks with spilling my seed. Was very busy with traveling for work, and was exhausted at the end of each day, too tired to even j/o. Don't know if this is the longest I've gone without, or not. But, when I got back from my trip and reunited with my partner, I had to have sex 4 times within a 2 hour period that day to get my pipes back to normal. The first time was almost like is was mechanical release, the orgasm wasn't all that great, but I shot a huge waterly load. The second and third times were among the most intense orgasms I've ever had, shot huge loads, very strong sputs, and the liquid was very thick and ropey. The fourth one was almost agony. My dick was getting sore, but I needed to do it one more time. (obsessive compulsive disorder)
What I noticed through that day was that my prostrate "felt" abnormal after the first time, as if there was some pressure there and a sensation of discomfort. I wasn't until after the 3rd time that it seemed to feel normal. After the fourth time, everything was overworked, but didn't seem to feel abnormal.
The next day, I jacked off again, and everything seemed great. That sensation of pressure and discomfort was gone.