The very first version took probably 3 months or so by just one person back in the mid 90s for MSDOS - but it was relatively simple! Have a read of http://forum.psquared.net/5263//What-came-before-Myriad-v3 for a bit more background.

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Peter Jarrett, Technical Director
Broadcast Radio Ltd.

Bill Bailey: No win, no fee, no basis in reality. Just a room above a minicab office in Acton and a steady stream of greedy simpletons whose delusion is only matched by their clumsiness

How long did it take to write and create the first version of myriad and how many people built it.