Entry 4
With pre-made heads I tended to get about 3 days, 50ml, on one before taste would go slightly off and I would change them out.  This is across several tanks, different suppliers.
Nowadays I roll my own coils, rebuildables.  I change wicks about every 3 days, but run the coils multiple times between changes.
I'm looking forward to trying ceramics again.  I tried an original Target, had very good results with one coil, not-so-great with another (this was an early run).  Based on the many people I know who have come to truly enjoy ceramic heads I'd love to try the EUC technology.