How many are there?

[lurkily]

I get [roughly] 1,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000 maps

Please, stop guessing. There are (2³²) - 1 = 4 294 967 295 maps.

Everybody who seems to know what they're talking about (beyond guessing at how many numbers can fit in the box) seems to agree with this assessment.

[Neko187]

ok, so the entry gets converted to a number, got it. this means FAR less maps. :(

[Echo51]

http://knucklecracker.com/forums/index.php?topic=8853.0
This thread shows that there's not all that many, and finding maps that were the same could very well have happend to somebody without the use of a script to check various combinations.