Hi,

I'm not sure which 'time period' you mean. The whole mission is just under 7 years long. During this time Solar Probe will make 24 orbits around the Sun. The first orbits don't go as close to the Sun as the later orbits (35 solar radii compared to later orbits which get down to about 10 solar radii; the Earth is at about 200 solar radii). The first orbits are about 5 months long and the last orbits are about 3 months long.

-Christina