Hello, people. A client is asking me to create a marketplace with the OpenSea site.
I don't really know how to estimate that, does anyone have the experience to tell me how long it can take to create a marketplace on that site?

Thank you!

We don't know how long it will take for you to create it

Opensea is opensource, so you can use the source code. But you need to create backend contract and api. If you do day and night work with proper verification it will take max 9days 😊

Why do I need to develop a backend? From what I have understood, they provide the frontend and the backend together with the contract they generate with the parameters they ask for.

Then what you asking for the opensea is already a marketplace as per i know.🤔

You ask how long time need to create a site on that marketplace

Well, I'm looking for someone who has worked with Opensea.
I have done a couple of projects already with Ethereum, but with OpenZeppelin - Truffle - Ethers - Ganache...
but I have not used anything like this OpenSea, then, I do not know well what it gives me.