I don't think increase GL duration time will fix monk. It will Just make monk easy to play. that's not the purpose to have a monk class in game. monk is supposed to be a hard play class by design. What monk real need is some skill could benefit group fight or increase monk Dmg. If you did good, you will be outstanding in DPS. right now is if you did perfect, your DPS is few percentage higher. If you did bad your DPS is far behind other class.