The final image in a 35 second time lapse of a Mexican Fence Post Cactus blooming 57 images exposed 6 minutes (5+ hours) apart using on board flash. Panasonic fz300 on board time lapse feature made this pretty simple.
PSE 18, On1 Photo RAW 19 & 20, Image Composite Editor, Windows 10
Sony A7III FF mirrorless, Sony FE 200-600mm f/5.6-6.3 G OSS lens, FE 24mm F1.4 GM lens, Sony FE 24-105mm f/4 G OSS, 70-400G, 70-300G, Sony A77 APS-C, Sony 16-80 CZ, Minolta 100 macro. Currently using PSE 2018, but had PSE 11, 10, 8, 6 and 3; PS LE and full PS.