Editing HorizonVirtual:Rewrite Descriptions (section)

==EXECUTING TIME==
Most rewrites have an executing time of 1 standard action. Others take 1 round or more, while a few require only a free action.

A rewrite that takes 1 round to execute is a full-round action. It comes into effect just before the beginning of your turn in the round after you began executing the rewrite. You then act normally after the rewrite is completed.

A rewrite that takes 1 minute to execute comes into effect just before your turn 1 minute later (and for each of those 10 rounds, you are executing a rewrite as a full-round action, just as noted above for 1- round executing times). These actions must be consecutive and uninterrupted, or the rewrite automatically fails.

When you begin a rewrite that takes 1 round or longer to execute, you must continue the concentration from the current round to just before your turn in the next round (at least). If you lose concentration before the executing is complete, you lose the rewrite.

A rewrite with an executing time of 1 free action doesn’t count against your normal limit of one rewrite per round. However, you may execute such a rewrite only once per round. Executing a rewrite with an executing time of 1 free action doesn’t provoke attacks of opportunity.

You make all pertinent decisions about a rewrite (range, target, area, effect, version, and so forth) when the rewrite comes into effect.