Respuesta :

In 28 days

hobbies: (painting + playing with dog + reading)
least:        28 (1.25 + 2.8 + 0.75) = 28(4.8)  = 134.4 hours
greatest:  28 (2.3 + 3.45 + 1.6) = 28(7.35) =  205.8 hours

The difference between the least and greatest:   205.8 - 134.4 = 71.4 hours