Many of the posters on this thread seem to disagree with you on the timeline.
I personally don’t think a single developer can achieve this in 2 months irrespective of the amount of hours or knowledge dedicated to it.
Remember that i also mentioned that we cannot use external libraries that have restrictive licences. This applies to many open source libraries.
So User Management, Authentication, User Authorization, Payment Gateway API, Front End, Admin, Cart System, Robust Inventory Management etc will be built from the ground up.
Take a look at the woocommerce product source code and see how it manipulates addons, attributes and product variations. This alone can take a whole month to build from scratch.
But as i earlier said, maybe a pro coder can do this within a very short time. I don’t think I can.