I'm not a freelancer so my advice may not be practical. Talk to your client, let them know 1) you are committed to finishing the project 2) you don't know how l

I'm not a freelancer so my advice may not be practical. Talk to your client, let them know 1) you are committed to finishing the project 2) you don't know how long it will take 3) you want to better understand your client's needs, and in doing so, you can get a better idea of how long it will take. Let them know that because you are a freelancer, you have other contracts too, so that will be a factor in determining how much time it will take to deliver for them. It's reasonable to say that not having any of the project fee will mean you need to have more parallel projects to pay the bills, and you might see if you can get some amount for work delivered so you can scale off other contracts and dedicate more time to them.