Most decent acts take under a minute. The hard part is deciding they’re your job.

The obstacle is almost never the effort. Holding a door, carrying a bag up a step, telling someone their light is on: all of it is seconds. What stops it is a quick calculation about whether this is your responsibility, and the honest answer is usually that it is nobody’s in particular.

Default to yes for one week on anything that would take less than sixty seconds. Do not wait to see whether somebody better placed is going to handle it. You will be surprised how little time it adds up to.