UDT Tag Polling Rate

If I have a UDT that has SQL tags and are set at a 5 min polling rate. When a UDT instance is created, when does the polling start? More specifically, if i have 100 instances of that UDT, will the tags all run the sql query at the same time?

Or does the tag polling timer start when the UDT instance is created and if the instances are created at different times the sql scripts will run a different times? or some could run at the same time?

Also, if i make changes to the UDT definition, that re-creates the instances so will the polling time be reset where all instances are going to be running the sql tags at the same time?