Arm workout duration?

(24-M-123lb) Does anyone know how long an arm workout should typically last to get the most efficient results? I've gained about 11 lbs since July roughly but I really want to make sure I'm putting some size onto my arms effectively. I workout my arms/chest 3 times per week at the moment but unsure on how long the workout should last. Any advice is most welcome. Thanks!

submitted by /u/SkinnyGuy1996
[link] [comments]