I recently asked from the professor whom I have done research with him and I also did great in his class for LOR. He agreed to write a positive letter of recommendation for me however when I talked to him further he said his letter is going to be one page double spaced. I am thinking this is really short letter according to some pages in the internet and also a post in this page
How long should letters of recommendation for students be?
Do you think this will hurt my chance of getting into top graduate school in US?