The last time I built my nextgen was 4 months ago.. even today when I dropped it and cracked the glass.. I just took it a part and cleaned it in a sonic cleaner then put on the metal tank till my glass replacement comes... no need to wick coil or rewick.. and the tank has been in daily use for the past 4 months.. mesh builds last months, if not years.
it's cleaner taste and flavour will last longer than on cotton builds even when it's junked up, normally it's a dry burn then it works again..
There are some very troublesome gennies out, but the modern new ones are great.. nextgen/nextiny, origennie and in'ax, are the ones imho to look out for.. I have the first two and the third should be with me tomorrow, small/big air.. mtl/dtl.. they will do it all. It is a warmer vape thou, vaping some of the bottom coil cotton tanks now feel like sucking on a mint.. lol