I don’t have a vexilar charger. I just have a charger that clips onto batteries.
Josh, on a brand new battery, it can vary from an hour to a few hours (or more). not knowing what charger you have or how many amps it charges with, will all make a guessing game out of this. The simple solution is to get a higher quality charger with an indicator LED on it. OR, if you have a battery tester like a Fluke, periodically disconnect the charger and test the voltage on the battery. Fully charged is usually about 13.1V.
If your over/or under charging, you will degrade the battery and shorten its life cycles. The better chargers are worth the extra $$ in the long run