@nosscire requested the following on the KSP Forum:

Hi, could I parhaps do a feature request? :)

When looking at this, I have no real idea of how long these experiments take to run. Is it enough to do a few orbits, or do I need a dedicated long term station? Does it differ between each experiment, or only between experiment types?

Essentially, If possible, I think it would be great if you added some details to the modules in-game, just so that you know what to expect before launching the experiments to space. It would help immensely with planning, as if you play with life support mods, there's a massive difference between 1 hour, 1 day, and 1 month in space. 

Thanks!

Investigating this, it's actually a little bit complicated because the time required to run an experiment depends on many things, including the definitions of the lab/lab equipment required to run the experiment.

It may be possible, but it's not trivial.

For now, instead of modifying the descriptions, the time an experiment will take is shown in the VAB when an experiment is loaded onto a vessel.