I am able to capture between 54-59 frames with these settings (almost 3 seconds). Actually for such static scenes I could use lower fps and just twixor later, but I thought I would try as is. I used mixed modes - 5x and without. Processed in Rawtherapee and encoded with ffmpeg/x264 (4:2:2). Lens - Canon pancake 40mm f 2.8
Enjoy!