It's harder for them to track the single rider line wait times, because it isn't consistent. It all depends on who is in the standby/
lightning lane at that time, and how the CM handles the lines altogether.
Once you go through once, you can probably get a decent idea of how long the wait is from certain points.
Earlier this week, we did RSR 3 times in about 45 minutes using the SRL in the morning, but later that evening I opted to purchase ILL after waiting for probably 15 minutes, because we weren't even to the disbursement point and I knew after the disbursement point was still 10-15 minutes.
Webslingers wasn't letting anyone through the SRL for a while one day, while ILL and stand by were still moving at a nice clip, so either there just weren't any off numbered groups for a while, or the person handling disbursement wasn't particularly efficient.
But overall, it was a very effective use of our time.