Just beat, started at Level 90.
Speed Run in under 4 hours.
Extremely easy, stick to ranged weapons and just run from main objective to main objective.
Stay stocked on food at all times.
In regards to case 6. i ran with 12 Tripod Zappers 6 Floating Lanterns and 9 Sentry Cats and it was extremely easy. Most people attempting to complete this should have absolutely no problems if they are a high level.
EDIT: Fontana fight. Ice Sword and about 15 seconds of swinging, nuff said.