My 925 has awesome battery life but just seems to take really long to charge, idk if I'm just use to the galaxy s 3 charging faster than normal or what but it seems to take a long time with the 925.
Read the amperage your charger puts out. If its less than 1A, buy a new one ASAP. Lol. 1.5A would be ideal. (it should show the amperage in tiny print on the plug)