You can have an estimation of a cable lengh attached to your Catalyst (I have only tested on C650X)

C6506#test cable-diagnostics tdr interface gigabitEthernet 4/46
TDR test started on interface Gi4/46
A TDR test can take a few seconds to run on an interface
Use ’show cable-diagnostics tdr’ to read the TDR results.

C6506#sh cable-diagnostics tdr interface gigabitEthernet 4/46

TDR test last run on: November 12 16:01:04
Interface Speed Pair Cable length        Distance to fault   Channel Pair status
——— —– —- ——————- ——————- ——- ————
Gi4/46    1000  1-2  5    +/- 6  m       N/A                 Pair A  Terminated
3-4  5    +/- 6  m       N/A                 Pair B  Terminated
5-6  6    +/- 6  m       N/A                 Pair C  Terminated
7-8  5    +/- 6  m       N/A                 Pair D  Terminated