There is no specific time limit for how long you can stay AFK (Away From Keyboard) on Roblox. However, it is important to note that staying AFK for extended periods of time can potentially result in being kicked from the game or server due to inactivity. The specific length of time that it takes for this to happen can vary depending on the game or server settings.
It is also worth noting that staying AFK for extended periods of time can be considered rude or disruptive to other players, particularly in games that rely on team-based gameplay or require active participation. If you need to take a break or step away from the game for an extended period of time, it is generally best to log out or exit the game rather than staying AFK.
All in all, while there is no specific time limit for how long you can stay AFK on Roblox, it is generally best to avoid doing so for extended periods of time in order to avoid being kicked from the game or disrupting other players.