Hi, I think for the money you would be better investing in a little better one like this.

http://www2.towerhobbies.com/cgi-bin...?&I=LXCLD5&P=0

You willl have more control over the chargers amps, voltages and peak cutoff. Another reason I would buy the paranha is that you can charge 1 cell (Glow starter)and 8 cell (transmiter) and everything in between.

You can safely charge NiMH 1.5 ma(mili amps) X Capasity.. 2700 mah. X 1.5ma = 4050 ma. Or 4 amps.
Time should be around 45 min. If you recharged at 2.7 amps, that should take about an hour. 2700mah = 2.7amp per hour.
Heat will be the real factor in how fast you can charge them. You dont want the packs to be hot hot when peaked, just a little hotter than warm. If that makes any sense.