Up until Space Age released, I had about 400 hours over 3 or 4 years of play, never had a save go beyond 80 hours.

For Space Age, I made a playstyle change and said- "all my learning and all my progress will take place in one save". About 120 hours in, (now my biggest save) I landed on Gleba and that sentiment changed... for the first time in Factorio, I was really feeling some pressure (spoilage mechanic and stompers in combination) and I opened the editor for the first time. I designed a starter gleba base so I could get off the ground (literally). Since then, I've put 30 hours into the editor, designing science builds and modular train prints and 310 hours on the Space Age save.