How long until a final MIDI file?
Five to seven working days

Several tracks can be for each drum?
Yes, as .rar packed and Download.

How can I add the completed files
in the Song?
Each file will be marked with a Click.

Which File Format should transmit
to be seen as Demo?
Technically easier music
should have been for a .mid enough,
for a complex Song
would be a .mp3 Advantage