When I bragged about my 100th Leyland prime find last August, I noted that I was moving up a leaderboard of probable-prime (PRP) discoverers. I currently have 131 Leyland primes under my belt and the last few days saw me take possession of position #44 on the PRP production score list, of which the above is a snippet.
Roughly, in the range where I am searching, every new find adds .01 to my production score. So to reach position #40 I have to come up with another 27 PRPs. My current rate of production is about five or six per month. So another five months.