Any MIDI sequencing software will let you edit the length of your midi file.As mentioned by gdroad software such Cakewalk express,proaudio,sonar, Steinberg Cubase etc. will allow you to edit a midi sequence in complete detail.
But if you just wanna edit the length, then you could try some thing like anvil studio.Doing so would surely save a lot of money.
Regards,
Jay.
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