After 2 weeks and 6 refills it finally got a hint of burnt taste so time to toss it. For others they may wash and reuse(budget minded folk). This is very good news to me seeing as they taste pretty good and give big fluffy clouds of vapour. 2 weeks use for around 3 bucks seems very reasonable to me.I can definitely give these a thumbs up. 
Edit: These are the ego mega dual coils the 5ml ones. So I basically smoked a whole bottle through it before having to throw it away.

Edit: These are the ego mega dual coils the 5ml ones. So I basically smoked a whole bottle through it before having to throw it away.
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