OK, I am confused... They are the same, RC x 5 for full charge and discharge. Then I ran into this.

Ok they are the same TC = RC = 2Ω x 470uF = 0.94ms
Then for discussion, they threw this in.

Once again, they are the same. Am I missing something here? They are not asking for the time to charge or discharge to and from specific voltages which would be different. As part of a rectifier smoothing filter the time the capacitor charges and discharges on the ripple would be differnt but that is not apparently what they are asking or is it?

 

As part of a rectifier smoothing filter the time the capacitor charges and discharges on the ripple would be differnt but that is not apparently what they are asking or is it?

I think that is exactly what the are asking for.
The charge time-constant is determined mainly by the diode resistance, and the discharge time-constant is determined by the load resistance.

 

The charge time-constant is determined mainly by the diode resistance, and the discharge time-constant is determined by the load resistance.

Aha! I missed that point. Thx crutschow!