Among the 4 climbing trails, on average it'll take about 5 hrs. 10 min. up and 2 hrs. 55 min. down. On the main Yoshida climbing course, if you're in good shape, from the 5th Station you should allow at least 5 hrs. up and about 3.5 hrs. down, as shown in the graphic below. You'll gain 1471 meters (4824 ft.), almost a vertical mile, which is comparable to climbing the 1250-ft-tall Empire State Building in New York City almost 4 times. Wow.
The contrast between the larger and brighter Mt. Fuji background and the smaller, more intensive middle ground of trees and foreground of darker blue patches is dramatic, yet balanced in terms of the distribution of visual weight. "Yoshiwara" by Hiroshige.