In the case of the Indians, urgency has rarely ever translated to results. I wouldn't hold my breath on AMCA development being much faster than Tejas. It may in fact be even slower.
One reason for the constant Tejas delays was attempts to incorporate new technologies during the development process. I believe that there will be substantial advances in technology in the time that AMCA is being developed--moreso than with Tejas--and so AMCA will be developed even slower.
Just you watch: they'll start with a fairly modest proposal of a simple LO fighter with a decent IWB capable of going toe-to-toe with early 5th gens like J-20, F-22, and then by the time the plane enters true serial production twenty to thirty years later, it'll have turned into some sort of CCA-networking hub with an extra seat jammed in, two LF radar antenna embedded in the leading edges of the wing, four different engine iterations (two American, one Russian, and finally one domestic), and asymmetric landing gear because they tried to jam in some EW stuff that would be better suited for a dedicated EW platform.