Asking for more time or resources

I've been working late every night for two weeks, and I know something has to give. In my one-to-one this morning, I decided to be honest with my manager. I want to make sure I do this properly , and right now I'm not confident I can deliver quality work by Friday. The scope has grown significantly since we started—what began as a ten-page report is now closer to thirty pages with three extra stak