Paul,
The spec for the Hot Shot glow drivers are:
Standard,,,,1500mah battery with a 150mah charger output.
Hot SHot II,,,,5000mah battery with a 500mah charger output.
Assuming the batteries were fully discharged it would take either system 10 hours to fully charge.
These charge rates are fairly low ( SAFE). Overnight should do it and at these low rates a LITTLE overcharging won't hurt.
The best way to take care of your new battery would be to fully discharge then charge for 10 hours.
Clay