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If you mean how much work you will have to do between when a contract is offered and when the book is published, the answer is that it will vary depending on how good the MS is and how well it fits...
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#2: Initial revision
If you mean how much work you will have to do between when a contract is offered and when the book is published, the answer is that it will vary depending on how good the MS is and how well it fits the publisher's needs. But it will probably be quite a lot and it will probably be the hardest work you have had to do on the novel to date because now somebody else will be holding you to account and you will be working to meet someone else's needs and demands, not just your own. But that work does not necessarily start when the contract is signed. Supposing you can actually get a publisher to look at your work at all (a big step in itself) then you may very well be asked to undertake substantial revisions on spec before a contract is even offered. Creating a novel that satisfies you is one thing. Creating one that satisfies another person, or set of people, people whose interests are at least as much commercial as they are literary, and often more commercial than literary, is something else again.