Thanks so much for all your great and very helpful feedback! If anything more comes to mind, I'll be very glad to hear it.

My conclusion so far: Personal timing is relevant and done by at least a majority of you. An app can be somewhat relevant, yet timing is somewhat easy to do with a normal chronograph [or high-end 99c-kitchen timer ;-)] and not worth a dead smartphone battery. Post-event results may be sufficient for some.

I'll also follow up with specifics to your individual posts.