It takes about as long to learn to play the electric drums as it does to learn acoustic drums, other than dealing with a few differences mentioned in the question above. How long it will take to play drums in general depends on a variety of factors such as the efficacy of your teacher or video courses, the drummer’s determination to improve and tenacity to keep practicing, and some amount of innate ability. If all goes right, new drummers can learn to play basic beats quite quickly, but practicing and improving will be a lifelong pursuit.