A question about Block?

Question

Does the move Block run out after a certain time? What I mean by this is that is the Foe prevented from switching until it faints/the battle ends, or will it run out after a certain amount of time? And will the move still be in play if I switch out my Pokemon? For example, say my Snorlax uses block to trap a Charizard. If I switch in my Lapras, will the Charizard now be able to flee, or will it still be 'Blocked' and unable to flee/switch out.

A good answer will get an upvote, the best will get the best answer. But please provide a source if you are considering answering the question, and comment if you don't have one, thanks.

Answer 1

Prevents the target from switching out. The target can still switch out if it is holding Shed Shell or uses Baton Pass, U-turn, or Volt Switch. If the target leaves the field using Baton Pass, the replacement will remain trapped. The effect ends if the user leaves the field or if the user or target faints. Note that if the user then uses Baton Pass, the effect will now end. Pokemon protected by Magic Coat or the ability Magic Bounce are unaffected and instead redirect this move back to the user. Does not prevent the effect of Eject Button. If the target is hit with Roar or Whirlwind while Block is in effect, they will be forced out as per normal.

Smogon

---

If the user switches out or uses Baton Pass, the target will no longer be Blocked, if the target or user faints the effects will go away, it will not wear off without this happening. Under the given circumstance, Charizard will be able to run away.