Hehe... I made this 6 Minutes Track in 2 Days:
And this 3 minutes-track took much more than 2 Weeks and lots of beer
It takes one day to realize a backgroundmusic, soundscapes and ambients... but sometimes you really can get problems when you try to copy that old Nintendo 90s Music.
Its not the length. My price depends on the quality somebody wants.
"You just give 100$ für 10 minutes orchestra-music?... well no problem I have 4 chords left" *loop*
And the creative process is one thing you cant really plan. If you want something special - it could take 1 Month just to get the great idea you know? ;o)
That is MY big problem in working with a client. I love it to have time to think about the composition, to make a sheet and correct it with billions of pencil-lines
The process of production, of making your ideas to sound can take hours, days, or weeks. I had a really big composition laying on my HD half a year before I "finished" it - and I still find details to update it evertime I hear it.... well I think I wouldnd sell that piece at all