I recently received a "revise and resubmit" decision for a submission to an Elsevier journal, and the deadline to resubmit is in about 5 weeks. Since I have to consult with my coauthors for my revision, and one of them is a professor who's not exactly fast in replying emails, I'm worried whether I'll be able to get a revision ready in time.
Is the resubmit deadline strict? Once the deadline passes and I don't make a resubmission, is the paper immediately rejected? Is it usually possible to ask for an extension?