Charge rates are usually talked about in terms of "C". C is the capacity of the pack in mAh. Charge rates are measured in mA (note the lack of "h"). A 1C rate is a 1 hour rate, and a pretty fast charge. So, to charge a 600mAh pack at "1C", you charge at 600mA. 2C is 1200mA.

For most packs, C is a nice safe rate that gets it charged fairly quickly. Nicads can usually be charged faster, but you do reduce the lifespan of the pack by charging too fast. I usually won't charge my Nicads at the field faster than 2C, but I have gone up to 4C for a "need a charge RIGHT NOW" situation (at a competition, it was charge fast or "0" the round, I opted to charge fast and accept that the pack might not live to see the end of the season).

I'm not familiar with your particular charger. The ones I have have either an alarm or a light that does something to tell you when it goes from full charge to trickle.