Taking 45 minutes time to make --prod --aot build of angular2 project when number of components are large, How to resolve this?

Question

we have implemented ANGULAR application by using Angular ~2.4.0 and webpack ^1.10.2.

it was implemented by Phase 1 and Phase 2 development.

after completion of Phase 1 development it tooks only 10 minutes of time to generate aot build.

but the problem starts after merging of Phase 2 development code with initial phase, now the aot build takes 45 minutes to generate build.

my question is there any techniques to reduce aot build generate time?

Thanks in advance.

command line blinking for 45 minutes without any indication.