Hi Jamie,
If you're charging NiMH batteries, you'll want more like 4-5amps. When these cells were the latest technology, it wasn't unheard of for people to charge them at 10amps or over, but that is dangerous and I wouldn't recommend this.
That charger only discharges at a maximum of 1amp, which will be why it is taking so long. It would be quicker to put them in your car and discharge the bulk of the power that way (although I appreciate this may not be practical). Also, if you do this, don't let it go too flat as you'll risk going lower than 0.9v per cell. Then put them on your discharger after that to get them to a more accurate discharge voltage.
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