Replaced oil injection hoses (preventative maintenance). Bled oil pump inlet hose by loosening screw. Then as per manual ran outboard at idle for a few minutes with just air in outlet oil hose to try and bleed. Got nervous as didn’t see much oil flow. I shut down motor and disconnected oil outlet hose and used syringe to fill hose. Re started and all seemed ok. So my question is how long can one operate outboard at idle speed without oil coming into fuel? Am I likely to have done any damage?