Ah, found it -- the labels for those two fields in setup are actually reversed. See http://pkp.sfu.ca/bugzilla/show_bug.cgi?id=8464
for a patch to correct it. Note that the two times are considered distinct -- i.e. the time expected for the review should not include the weeks expected for the response -- so you would fill in 1 and 5 (respectively) if you think the review will take 4 weeks and the confirmation will take 1 week. Hope that makes sense.
Public Knowledge Project Team