I didn't time mine, but I went through a similar process to figure out there was a delay and that the chargers are indeed working. My hoppers came back Monday from late Jan RMAs. At first they didn't seem to be producing much in the way of clouds so I cleaned the threads on the backend and tried different batteries and turned the temp dial a few times and it starting giving me clouds pretty much like it should. Since then I've noticed that I do have to play with the temp dial sometimes to keep it going strong, but they are working. My problems with my hoppers was that they were instantaneously incinerating my herb. Not just burning it or combusting it, but turning it into complete ash in a nanosecond, it was freaky. Since they've come back they are not heating as hot as they were before I ever had the incineration problems. My ABV used to be a nice dark brown, now it's a dark blond color and while I get clouds, it's not at the level it used to be. I think I'm going to wait until they get all caught up with everything and send them in one at a time to see if I can get them turned up a little bit. But they are working great so far, I just hope they keep it up.