Around 2 hours 26 minutes to beat. This was on the lowest traffic and time difficulty settings and under the "Play by arcade rules" choice in Arcade mode. It seems you have to select Play By Arcade rules under "Arcade" to get the ending. When I got S ranking in 10 minute mode I got no ending. You need to earn 5,000 dollars to get the ending in Arcade mode under Play By Arcade rules mode. It takes some time to get into a flow with the game but definately addictive once you get a feel for the map and gameplay. Plan to play through the other ports and sequels as well.
Check out the tutorial version with commentary if interested in a breakdown.
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