From the days of the Barn Door Tracker
541 seconds (yes, 9 minutes) on home made Barn Door Tracker, Nikon D70, Tamron 18-270 Zoom at 18mm f/4.0, ISo 400
Converted from RAW to DNG by Adobe Raw Converter then DNG to JPG by photoshop
No other processing was done, no color balance, no brightness, no stacking . . .
It was images like this that inspired me to continue in the hobby and (later) get better equipment.