development times...

hello all; I’m doing a research to understand how fast it’s the development work in products that are inside of the fashion universe; and it would like some opinions, mainly of the professionals that work in companies.

how long of the idea (briefing) to the production line?

how long of research?

how long of drawing?

Mockup?

Usually how long it is considered to re-do the things?

I have special interest in the process of the: tennis, sandals and slippers, if somebody can help I thanks a lot, mainly if it comes with what product type spoke and it is clear an evolution or a need of doing that more and more fast.

thanks