well,since I've just finished testing my Ferretti 247 (H-factory,got it new from a trusted dealer for around 170 bucks) and I haven't posted anything in this forum yet,I've decided to share my experience: the first time I wound the watch it lasted for about 20 hours.I stopped winding as soon as I felt the resistence and thought it would suffice (as a noob, I haven't had any experience with manual winding mechanisms before).Since 20 hours was far below the standard I've decided to check around learned I should keep winding untill the crown couldn't be turned any further.It took my about 70 turns,but here I am with astonishing 57 hours and a few minutes more!