What size is the pack and what is the output of the wall charger? The charger output will be stated on a label in milliamps. Take the mah rating of your pack and divide it by the output of the charger. Example a 1400mah (1.4 amp hours) pack charged with a 100 milliamp (.1 amp) charger will take 14 hours to charge.
chrger charges at 100 milliamps but the pack doesn't say the mah.my friend bought it at hobbytown with the charger. its made by ofna, and ofna only has a 1600 mah listed on their website so i guess ill just charge it for 16 hours.