The question on which time frame to use is asked every week on ET.
How about this one:
What is the best time to end a time frame?
If you select a 5-min time frame, where does that time frame should end?
At (9:35, 9:40, 9:45,...), or, (9:36, 9:41, 9:46,...), or else (9:37:30, 9:42:30, 9:47:30...