The following is the opening line from an article of Scientific American.
The amount of time people spend watching television is astonishing. On average, individuals in the industrialized world devote three hours a day to the pursuit—fully half of their leisure time, and more than on any single activity save work and sleep.
As the comparison is to which activity they devote more time, it should be "and more than to any single activity" instead of "and more than on any single activity". Am I wrong?