BeccaJane, I'm not 100% certain, but I think they mean ALL, not those left. So of all the apps, 23% get done in 5 days, additional 1% get done in 10 days and so on.
ETA: To be clearer: if you submitted your app in x date, you have a 23% chance of it being done in 5 days or fewer, 24% if it being done in 10 days or fewer, 26% chance of it being done in 15 days or fewer, 66% chance of it being done in 30 days or fewer and so on.