How long can i run a MIDI cable before it becomes a problem? I just bought a Korg Kaoss Pad KP2 but then realized that i?ve run out of ports on my MIDI-interface

Now one of my ports is connected to my Sherman Filterbank 2 (only in since it doesn?t send anything but trigger on signals on the out) so i thought i could do as below since they both only use one MIDI-channel each but don?t know if the MIDI-cables will be to long beacuse they will be on each side of my desk.
This is what i?m thinking of doing:
MIDI interface out ---(3 meters)---> Sherman Filterbank in
Sherman Filterbank thru ---(5-6 meters)---> Kaoss Pad in
Kaoss Pad out ---(3 meters)---> MIDI interface in
Total lenght 11-12 meters.
Will i get a problem with this or is it just fine?