I went through that with a coworker who kept saying hi and quick call. I reckon we are from different continents and with way different cultures so I once entered one of these "quick call" and asked him politely if in the future he could ask his question directly and I would answer when I have time and that would leave me time to check for information if needed. I also asked him if he could put some context when asking for a call so that I can decide to ask him to schedule a meeting some other day or accept it right away depending on my schedule/load.
Once in a while he goes back to his old ways but more often than not he is adding context.
Some people just think you are their personnal stackoverflow / github copilot if you don't put any limit.
