I can see stressing over dev times when it's short like 5 minutes or less, some of the dev times can be about 4 minutes or you have to adjust the dilution (HC-110 & Ifsol 3 come to mind) and pouring in a 2 reel (120) tank takes me 22 seconds with a 3 reel (120) tank it takes 36 seconds which is significant in a 5 minute window, that said... I've honestly never had an issue with uneven development even at fast times.