When it comes to vaporizing dabs, there is no one-size-fits-all answer to the question of how long to heat your nail up for. The amount of time required will vary depending on several factors, including the type of nail you're using, the size and shape of your dab, and your personal preferences.
That said, there are a few general guidelines you can follow when heating your nail for dabs. First, if you're using a quartz banger or titanium nail, you'll want to preheat the nail until it's red hot before adding your dab. This will help ensure that your dab is vaporized evenly and completely.
If you're using a ceramic nail, on the other hand, you'll want to preheat the nail until it's just starting to turn red. Adding your dab too soon after reaching this point can result in uneven vaporization and wasted product.
Once you've added your dab to the heated nail, use a carb cap or another type of airflow restrictor to control the rate at which air flows over the surface of the oil. Slowly inhale the vapors produced for best results.