Notes. Depth (5σ for a point source) and exposure times at each visit for a 4-day cadence of the proposed DESIRE joint SN survey. The exposure times for LSST i and z bands assume nominal observing conditions. For Euclid NIR bands, the exposures times are the ones that would deliver the required depth in a single exposure, if such long exposures are technically possible. The S/N calculations are described in Appendix A.