This is actually slightly computer related. I am setting up several computers. The electrical outlets are under the table. The tables are permanently mounted to the wall. I am having to drill holes through the table to plug in the computers.

I know that this is pretty far off the usual topics, but maybe someone can take pity on me. I have a cordless drill with an 18 volt battery. The charger says: Input 120 V AC ~ 60 Hz Output 22 V DC, 500 mA.

So, how long do I have to leave the battery on the charger, or is the time required impossible to determine given the details? I'd rather not leave my equipment here over night.

I am pretty stupid when it comes to electrical formulas and conversions.