You can certainly improve your speed at developing your product ideas, from a napkin to a prototype in front of testers, for example by adopting familiar technology instead of spending time to select unfamiliar technology and wasting time with the mistakes you make learning it.
However, your productivity isn't particularly correlated with the time you need to "validate an idea", which consists largely of reaching people and make them try your product, waiting for their feedback, and accumulating enough feedback to form a meaningful opinion.
You can certainly improve your speed at developing your product ideas, from a napkin to a prototype in front of testers, for example by adopting familiar technology instead of spending time to select unfamiliar technology and wasting time with the mistakes you make learning it.
However, your productivity isn't particularly correlated with the time you need to "validate an idea", which consists largely of reaching people and make them try your product, waiting for their feedback, and accumulating enough feedback to form a meaningful opinion.