Just finished the first case and want to know how much time I should devote each case as I hope to be able to play each case uninteruppted.

The first case about 1 hour, maybe 10-20 mins more. The rest just go down in time, the last one taken me 40 mins.

(And Don't say "But you've only got the first case achievement", because I completed the game on my old gamertag 'Currrrtisssss')

The first case takes longer probabkly because you still have to made yourself to the game. But once you now the routines, it becomes quicker after every case.

Overall it takes between 6-8 hours to complete the game

The first case was definitely the longest, because of getting used to the flow of the game. It took me around 3 hours because I was determined not to use any hints or guides!

I do wish they had been a little more creative with the achievements for this game. Like maybe, find all insects, get master ranking for the cases, etc.