I am saving my second shirt and third pair of shorts for the halfway point. For now, I wash and wear the one shirt. Meaning I take off my shirt, wash it, and put it back on to dry. I rotate my two pairs of shorts. Wearing wet shorts until they dry is no good for a number of reasons, but mostly I am trying to avoid the rower's equivalent of diaper rash.
Shorts seem to dry okay after a long afternoon in the sun.
My shirt dries in an hour or so when it is on me, but it would require a day of good sun to dry otherwise. The difficulty is that in this situation it is extremely difficult to rinse all the salt from the material and the salt holds the water. First I wash my hair. This is a great pleasure. Then I use the same water to sponge off the rest of my body.