CE2's can last a LONG time - its one of my favorite aspects of them. I usually only get 2 or 3 days use (heavy vaping, 100% VG) before I need to clean it, but especially when they're in a tank like this, they're incredibly easy to clean - and depending on how gentle you are when cleaning, you can clean them 10 to 15 times before the wick material starts falling apart.
I can clean mine in less than 5 minutes - you just pop the tank off, run under hot water (I usually also sort of massage the juice out of the wicks under the stream of water), thoroughly dry the wicks by squeezing them -gently- with a paper towel. Then put it on a battery and do several dry burns - this burns off all the build-up on the coils. Blow (or brush) off the resulting ash, then put the tank back on, fill it up, and you're good to go.
If you use thick juice, you do sometimes have to help it wick after its been in use for a couple days - turning it upside down and rolling the juice around up by the cup helps... If you have to do that before every puff, its probably time to give it a cleaning. Because of the way they're constructed, you do also have to be more mindful of what position you leave them. If its full, and you lay it on its side, it can flood the center shaft.
But IMHO, once you get into the groove with them, they're the best.