Can long sits be easier than short sits?

I tend to write down when I meditate, and also note the length of the sessions. Observing my notes, I had the impression that when I sat for longer times (40m - 1h), I also was paradoxically more consistent. Is such a thing ever mentioned in Buddhism? Usually, in habit formation psychology, it is the easiest habits that develop the most. Could lengthening meditation sessions also establish greater consistency?