Sony's upcoming SharePlay for the PlayStation 4 sounds like a fun way to sit with friends online and help them through certain situations. You'll be able to take control of their game and play as if you were in the same room with them and they passed you the controller. However, there is a limit.
Gamespot confirmed that each session will have a time limit of one hour. Now, there doesn't seem to be a limit as to how many sessions you can partake in, but there's no word if you have to wait a certain amount of time before you can re-initiate a session with the same person.
I'm sure this was put in to help curb folks from leaving their console on and have someone play a game indefinitely. An hour is still reasonable in my opinion and you can at least restart a session. More details should pop out in the future, and I can't wait for this little feature to show up on my PlayStation 4.