Is there a way to arrange a reciprocal exchange for different lengths of time? For example, I go to Joe’s house for 5 days and he comes to mine for 8 days but we’re not exchanging any guest points?
Both partners edit their listing to choose the option 0 guestpoints for reciprocal exchanges.
Absolutely.
Just change the dates in the exchange details before finalize it (in the conversation). Same for non-simultaneous exchanges 
As Susan said, if you don’t want any points exchanged, make sure that both members have selected the option “no GP for reciprocal exchange” in their profiles.
Ok, thanks for the assistance. I am new to HE and I wasn’t sure if I changed one person’s dates whether it would change the other person’s automatically. And didn’t want to try it with an active conversation just to see if it worked! Thanks again.