RI Department of Health enforces 30 minute on scene resuscitation.
Considering Providence transports average under five minutes, and the public we serve are not the kindest bunch, and heavily armed to boot, I think I would have to break the rules.
Defibrillate, CPR, IV and roll, more or less, run the rest of the code enroute. Mandating time on scene is an insult to EMS. No two scenes are alike, no two patients are the same.