
Hey Jaxon. Lead with appreciation, state the boundary, give a specific timeframe, and offer an option that works. Try this: "I love hanging out with you, and I do better with a bit of notice so I can plan around work and downtime." "Could we aim for at least 24 hours notice for plans, or two days for evenings, and if something is last minute I may pass?" Then add an alternative: "If you want to do something this week, I'm free Thursday after 6."
If they invite you same day, you can respond, "Thanks for thinking of me. I cannot today with such short notice, but I could do tomorrow after 7 or Saturday morning." If they push, keep it short and consistent: "I really need a day's notice. Let's plan for tomorrow." Say it once in a normal moment too, not only when turning something down, so it feels like a standing preference rather than a rejection. Keep the tone warm and confident, avoid apologizing for having a boundary, and do not over explain. If you are not sure what window you need, start with 24 hours and adjust after a week based on how stressed you feel. If you occasionally want to be spontaneous and label it as an exception so the rule stays clear: "I can swing today because my afternoon freed up & but in general I need that day of notice."