Its the job type that we get around here, non time critical medical calls that dont benefit yourself or the patient by busting your ass to meet a deadline that doesn't need to be there. We generally work as a crew of 2 without assistance so you probably spend 7-10 full minutes asking questions and then another 5-10 on management but the time is lost in moving patients from the house to the truck.
Patients with pain i will happily sit aorund for half an hour getting enough effect from narcotics before i attempt to move them.
Then there are those patients you cant physically move so you wait 20mins for another crew to assist
Time critical patients (STEMIs accepted) i can get out in around 10-15, but theres a few variables in that, and i always have an IV in those before i move them in case they drop their bundle - unless they are particularly difficult, but thats not very often. Complicated trauma patients 20 minutes is about normal if your on your own. 2 Guys providing all the care and extrication from vehicle/house naturally takes a few more minutes than having 4 guys there.
So, my answer is i make the decison on a case by case basis, ill scoop and run when i need to and ill stay and play when i decide its appropriate and all my decision making is based on safety for me and the best care for the patient.
As an aside note, i often find the ability to have a short scene time is not so much a reflection on the guy running the job but the organizational skill of your partner. Theres a lot of good ambos out there who are not good partners and being a good partner is often more dificult than being a good clinician