Experienced speakers, what's your prep time factor for a talk you consider useful, solid, and well delivered?

Assume "talk time" is just the time spent on stage, and "prep time" encompasses all of drafting, writing, preparing slides, editing, and rehearsal. (Including any work you spend on the talk proposal, of course.)

"For every minute of talk time, I spend ___ minutes of prep time."

Boosts appreciated.

A: 10 or less
6.1%
B: Between 10 and 30
53.1%
C: Between 30 and 60
34.7%
D: More than 60
6.1%
Poll ended at .
@xahteiwi Hard to answer. The best talks are iteration 10+ of that talk, where you have spent time to improve and integrate insights/feedback from your public between each presentation. Hard to gauge that time investment. Also, a new talk doesn't just happen... I've been working on a topic for a long time before I can start to prepare a talk.
@fschaap Easy to answer; you're definitely in the D category for a new talk. For precisely the reasons you outline. 🙂