When to change coils.

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Apart from the obvious changing of coils for burnt taste or very poor taste I'm wondering if while vaping (.5 ohm tfv8 on alien) the time I can get a vape is between 4-6 seconds before it becomes unpleasant on the throat (not burnt)it time to change coils. I'm using 6mg juice with 80/20 vgpg
Thanks

When to change coils.