Time-delay and source-redshift distribution for 100 investigated mock LSNe for baseline2018a, similar to Fig. 12. Upper two panels: standard follow-up observation (first panel) and the option going one magnitude deeper (second panel). Lower two panels: same follow-up scenarios hypothetically without microlensing. The distributions vary slightly because for a quad system just a single time delay is shown, either the first successfully measured delay or the maximum of the six possible delays.