To clarify
The hourly rate is paid from check in to check out for the whole trip.
eg. Check in at midday on tues to check out on midday thurs is 48 hours.
48 x 2.40 = 115.20 , so MF can earn up to 67.60 per day.
Strictly speaking, using CAA terminology, a duty day is from start of briefing to chocks on of last sector.
You are confusing different use of the term "duty" day.