Got it, that's very helpful! Sounds like the best approach is to give the specific dates then and request they submit early, if possible.
Good luck on your apps!
Are deadlines provided to recommenders when they receive the submission form? If not, is it standard practice for applicants to group deadlines together (e.g., provide a 1/1 deadline for actual deadlines ranging from 1/1 to 1/15), or is this considered unethical?
Sorry if this is an uninformed question, just trying to see what is accepted practice.