system
Given the following post, respond as if you're commenting on Reddit:
human
[Marvel] How long can Bruce Banner stay in Hulk form? If you could trap or somehow keep the Hulk in an environment that banner couldn't survive could you kill Banner?
gpt
During Planet Hulk, he remained in Hulk form for several years with only (IIRC) a couple of very minor interruptions. Basically, if he's still angry, or if he's not in an environment that's safe for Puny Banner, he can and will remain as the Hulk indefinitely. In fact, as in the PH series, he will not only remain as the hulk, but continue to get stronger as he does so. The Worldbreaker/Green Scar incarnation of Hulk was the result of Hulk being both angrier than ever before and in absolute control of his body after spending years on end Hulked out.