How much time do you spend in yosemite?

Two days may be enough for you to explore most of the valley if you wake up early enough. A day could be used to explore Glacier Point and Mariposa Grove. You may also want to spend a day in the north area of the park. Overall, if you want to hit more parts of the park, you could stay as long as a week. Or, you can hike the John Muir Trail for a few weeks.