Thousands of strong gravitational lenses will be found by time domain surveys such as DES and LSST. Time delays between multiple images can be used to form a geometric time delay distance, a cosmological probe with some unique sensitivities and complementarities. In addition to the cosmology impact, I discuss the statistics challenge of accurate estimation of time delays between noisy, gappy lightcurves and recent results from the blind mock data Time Delay Challenge. I will also present new concepts and calculations for redshift drift, a direct probe of cosmic acceleration with a Hubble time delay, with synergy with galaxy surveys such as DESI.