  Circumbinary planets are generally more likely to transit than equivalent
single-star planets, but practically the geometry and orbital dynamics of
circumbinary planets make the chance of observing a transit inherently
time-dependent. In this follow-up paper to Martin & Triaud (2015), the
time-dependence is probed deeper by analytically calculating when and for how
long the binary and planet orbits overlap, allowing for transits to occur. The
derived equations are applied to the known transiting circumbinary planets
found by Kepler to predict when future transits will occur, and whether they
will be observable by upcoming space telescopes TESS, CHEOPS and PLATO. The
majority of these planets spend less than 50% of their time in a transiting
configuration, some less than 20%. From this it is calculated that the known
Kepler eclipsing binaries likely host an additional ~ 17 - 30 circumbinary
planets that are similar to the ten published discoveries, and they will
ultimately transit some day, potentially during the TESS and PLATO surveys.
