How long will my shatter pen last?

I just started using the "DR. D. ADAPT: VAPE AND SHATTER" pen. I dig it, it works really well compared to how I've been smoking CBD flower for the past few months. I was wondering how long the pen will last before I should seek a replacement. I use it a few times throughout the day myself, and my husband likes to use it in the evening once I return from work.  Thank you to anyone who can give me any insight on this.

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