Presumably you're talking about for non-FRC purposes?
If it's for FRC, you should be using the WPI or NI libraries from the RoboRIO to do the interface, and this is way down on your "don't worry about it" list.
From page 5 of the
Talon SRX User's Guide:
Quote:
PWM Input Pulse (High Time): 1 – 2 ms Nominal 0.6 – 2.4ms max
PWM Input Rate (Period): 2.9 – 100ms
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If you're writing your own setup for a user operated device, I'd try to synchronize the joystick sampling rate to the PWM output rate; 60-100Hz is usually plenty for these purposes.