Quote: "Do you think that this software can be used for a rather large single player game? A game that takes six hours to complete?"
short answer, yes- mathmatically it is possible
long answer: yes, but you wouldn't want to try. let's assume for example each level is derivative of the style of the last, and each one is a gigantic puzzle (the longest of which in an fpsc game has taken me about 10 minutes)
there can be a maximum of 50 fpsc game levels in an fpsc game, assuming each is just as big the last and the player will take the same amount of time in each level- that's 500 minutes or 8 hours and 20 minutes.
now can that really be done? sure, but it will be very boring. I for one would rather play a really great short 2 hour game,(I.E. portal) than be forced to trodge through a 8 hour long nightmare, hoping for it to get better as I played, only to realize as the credits rolled that I had just wasted my time. (I.E. Modern Warfare 2

)
this being said, most people are likely to run short on media, inspiration, or patience by the time they've made even 10, genuinely quality, full sized, 10 minute long maps. (probably long before)
the best advice I can give, is not to plan a game to be a certain length, but to plan it to accomplish a certain number of goals (I.E. tell a story, introduce certain characters, and go through a set of locations) regardless of the length, you'll have made a great game. because you designed for fun-factor rather than an arbitrary length requirement determined by the length of other (usually bad) games.
happy designing
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skype = isaacpreston. I want to talk to YOU
