Hydraulic Clutch Travel- is One Inch enough?

[chevybill]

After doing several husband and daddy duties over the past month I finally got a chance to work on the truck today. In the picture below you can see my linkage setup inside the cab. The plunger is moving about 1 inch when the clutch pedal is pressed all the way to the floor. Is 1 inch of travel enough for the clutch to work correctly?
Welding a metal bracket around this plastic clutch cylinder assembly was stressfull and tedious to say the least.Thanks for the help, this is a NV 3500 late model tranny and clutch assembly from a 98 model with a home made bracket bolted to the firewall.
It's the best I can do with my limited tools and working alone.