How Long Can The C-channel Be?

Can anyone tell me how long the robot can be (not that I don’t know) it’s just that how many holes can the c-channels have?
25 hole? 30 hole? 35 hole? Because I’m making a robot but I just don’t know …well I forgot the maximum holes the c-channel can be.

VEX metal has holes on a .5" pitch; therefore a 35-long C-channel just under the 18" limit for EDR if you’re making a square chassis.

The most holes that come in any C channel is 253, however, you can drill as many extra holes as you want. @antichamber can demonstrate the whole “swiss cheese” effect.