I haven't personally used an HH357 yet for personal reasons. But, with all atomizers. They usually last anywhere from a few day up to a year. Depending if it's either a; dud, your
vaping method, maintenance, and sheer luck. So, it's very hard to know how long that an atty will last overall.
A few ways to help increase your atties life is to take a few minutes break every 5-8 hits. This is because the coil can get very hot. Which can get to the point to where you can pop the coil if you go overboard. Meaning that your atty is now dead. Another tip is don't drip or feed your atty when it's hot. This can also pop the coil. Had that happen a few times and learned my lesson.
Anyways, you've been doing the right thing. Regular maintenance is key to keep your atty last longer. Personally, I clean it after I get
through 3-6ml to prevent the coil from being gunked up.
You will know that your atty is dead when it doesn't produce any vapor anymore. Basically getting nothing when you hit the firing button. Also, the longer you use an atty. The lower the ohms become. For example, a 2 ohm atty will eventually drop to 1.5 ohm later on down the line. Doesn't mean that it's going to give you a better
vape however. I notice that it's the opposite and less vapor is produced. So, it's good to either own a voltage indicator or multimeter. That will come in handy with other applications. Such as checking your batts to see if it's safe or not (higher then 4.17 or 4.2V).
