Question: How long does it take to beat Mystery P.I.: The Lottery Ticket for the Windows PC?
Answer: It took me approximately 7 hours to beat the main story in Mystery P.I.: The Lottery Ticket.
I estimate that it's going to take me an additional 5 hours to complete that games "Unlimited Seek & Find" challenge.
Notes: I paid $2.49 for Mystery P.I.: The Lottery Ticket, making my first and last playthrough cost approximately $0.21 per hour.
Be warned that Mystery P.I.: The Lottery Ticket is limited to the 800x600 screen resolution. It was annoying to play that game on a 1920x1080 monitor in both window mode (some objects are too small to identify in a timely manner), and full screen mode (some objects are too distorted to identify in a timely manner).