Delayed CheckSwing Appeal

[tibear]

Situation: bases loaded and 1 out, count 3-2. Batter apparently pulls back a checkswing on the pitch and the PU awards base on balls.

As the runner from third is jogging from third the catcher casually walks 8 feet up the third base line and tags the runner as they pass, then turns to the plate umpire and wants to appeal the last pitch to the BU for possible strike three call.

Would you allow the appeal and subsequent double play??

This was brought up on another site and I indicated that I wouldn't allow the appeal because there had been too long a delay between the pitch and the appeal. As well, the tag of the R3 was not part of the original play(pitched ball) and I would interpret that as another "play" had taken place and the defence had lost it right to appeal.

How long should the runners remain on their TOP base before ensuring their advance is really without jeopardy of being tagged out as a result of a checkswing appeal??

Comments??