Dissimilar welding is always a tedious task to achieve due to the variation in thermophysical properties of different parent materials. The fusion welding of Inconel 625 superalloy with AISI 316L is a very challenging task due to the formation of different intermetallic phases during solidification. The current work attempts to understand the impact of welding time during resistance spot welding (RSW) of Inconel 625 (IN625) with AISI 316L stainless steel (SS316L). The welding time is varied between 40–80 s with an interval of 20 s each to obtain sound weld nuggets by keeping another parameter constant. It is observed that with an increase in welding time, the tensile-shear load-bearing capacity (LBC) of the weld nugget is showing a significant improvement along with three-point bending strength. The fracture surface analysis reveals that the specimen with the highest welding time failed in tearing fracture mode, and the other two failed in a partial interfacial mode of failure. The three-point bending test reveals that the energy absorption and maximum flexural stress are higher when the welding time is maximum.