I think it depends on the tank/coils. I run 5 Uwell Crown 3 tanks and the coils last for ages, weeks, but have a couple of Trillium tanks using Eleaf coils that don't last that long in comparison, the last tank/coil set up came with the Eleaf Invoke, again Eleaf coils, last about a week.
Obviously how much power you put through them will influence the life of your coil but unlike the Crown 2 the Crown 3 seems to have sorted out the longevity issues.