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With only 11 days left you are in a very bad position to get a good utility patent on file. You will have a hard time finding a patent attorney that can drop everything and prepare the utility patent within that time frame, and the quality may suffer as well. The cost depends on the complexity of the invention and the quality of the provisional patent, but should be at least $4k. In any case I hope you already have a patent attorney otherwise you better find one in the next few days or else you will not make the deadline.
As far as the odds of getting the patent, your patent attorney MIGHT be able to tell you that but it's only a guess without a detailed review of the prior art patents (which is something you would have to pay extra for)
also, you may get charged more for a rush job like this one
yes it should be less but only to the extent of the quality of the provisional patent, if the provisional patent is not good then it doesn't help and the cost will not be less. for example, if the provisional patent was not prepared by a patent attorney then most likely it is of little help and the price will not be affected much....and in that case the cost for preparation and fees will be at least $6k for most patents, and the average is around $7-8k.
and those are small law firm or solo practitioner prices, larger firms will cost much more
let me know if you need clarification. and PLEASE DON'T FORGET TO RATE ME SO THAT I GET CREDIT