Both the Jupiter and Saturn flyby take 7 turns (3.5 years) to arrive. That hardly seems right since Saturn is nearly twice as far from the Sun as Jupiter. Historically our probes took between a year and a half and two years to reach Jupiter, and 3-6.5 years for Saturn. Maybe in the game, we should make it 4 turns to Jupiter and 7 or 8 to reach Saturn.

Probe           Launch    Jupiter                Saturn
Pioneer 10     3/72      12/73(1yr,9mo)       --
Pioneer 11     4/73      12/74(1yr,8mo)   9/79 (6yr,5mo)
Voyager 1      9/77       3/79 (1yr,6mo)   11/80(3yr,2mo)
Voyager 2      8/77       7/79(1yr,11mo)  8/81 (4 yrs)