How long is the contract?
Do you need a lawyer to understand it?
How much is the project worth?
If it's a 10k project and a 20 page contract I offer to bill for my lawyer.
If it's a 200k project and a 20 page contract then I had better have lawyer time built in.
Usually I offer up my contract if the client contract is more than 2 or 3 pages because you can actually read what mine says.