Every SIP calculator shows one smooth, rising line. Real markets do not move in a line. This one runs your SIP against every start month from 1996 to 2026 and shows the full spread: how often a SIP that length still finished in the red, and the worst, the typical and the best you would have lived through.
Same market, same SIP. The only thing that changes is how long you sat still. The worst one-year run lost 36%; the worst ten-year run lost 17% and there were far fewer of them. Quitting early is the one move that locks the bad number in.