How might I measure the proportion of a ride spent in various hand positions, or has it been studied? This is something I've been pondering for a while, but a recent question How much faster when using drops and particularly Weiwen Ng's answer prompted me to give it more thought.
It's often said that most of the time on a drop bar bike is spent on the hoods, and that feels plausible, but I know with sustained headwinds I've ridden a long way in the drops (and much of the rest on the tops for a stretch on the rare sections out of the wind).  To plug in to calculators, and for curiosity, how might I measure the proportion of a (long) ride spent in various positions?  I'd assume a solo ride, so any solution would need to be mounted on the bike and not affect riding (too much) though a difference between solo and group rides would be particularly interesting and may explain some comfort issues.  Alternatively published data would be of interest, though very limited interest if it relates to pro races.
The cheap solution would be to obtain a bunch of stopwatches. Label one for tops, one for hoods, one for drops, etc. When you switch hand positions, stop the current stopwatch and start the applicable next one.