Typical transits last a few hours, and exposures times are typically a few minutes. So you have up to hundreds of exposures per transit. I guess how "statistica

Typical transits last a few hours, and exposures times are typically a few minutes. So you have up to hundreds of exposures per transit. I guess how "statistically recoverable" this data is depends beside the resolution also on the noise level. The atmosphere introduces a lot of variability in ground-based observations, and a star's brightness is not constant either.