Avoid accumulating too many flags on single-body systems.

- Increase sightseeing time to 15 seconds
- Increase launch thrust time to 5 seconds
- Decrease flag lifetime to 15 minutes

Change-Id: I2e85142a1d56acb684ff1750094f61b9e230444f
Fixes: 320695719
Test: adb shell am start -n com.android.egg/.landroid.MainActivity
Flag: com.android.egg.flags.flag_flag