If we start hiking at about 6:30-7am, we should be done by about 2pm. Depending on time constraints, I wouldn't be opposed to turning around a little early. Since it's an out-and-back, we have flexibility in terms of cutting it short if need be.
Probably the best meeting spot is Power Road and McDowell, which is just south of the 202. There's an Albertson's (and some gas station) at the SE corner there. If you drive in on the 202 that's probably the most convenient place for both of us, and from there we just take Power Road up to the Bush Hwy, to 87, etc.