They’re never long enough. It almost makes it to my computer, but an inch in front of the plug I run out of cable. That’s why I’m glad Belkin makes an extension cable to keep life simple.
The Extension Cable Straight-through, 25 Conductor is most commonly used to extend the length of an existing DB25 cable assembly, but it can also be used as a PC to serial modem cable.

Specification

Product
Product id	161072
Brand	Belkin
Partnr	F3D112B05M-GLD
EAN/UPC code	722868309087
Warranty (months)	Lifetime
Technical details
Product colour	Black
Features
Cable length	5 m
Other features
Connector(s)	DB25 m/f