How to calculate the frequency of cyclohexane conformational interconversion?
Look up application of the rate of reaction equation given barrier height and energy available at room temp, $kT$ (Boltzmann's constant).

$k = A \mathrm e^{ - \frac{E_\mathrm a}{RT} }$

http://research.cm.utexas.edu/nbauld/teach/cyhexconf.jpeg 

Twist-boat leads to mathematically perfect geometric chirality, 
Symmetry: Culture and Science 19(4) 307-316 (2008).