Meeting with a client, preparing a return, reviewing a return, and assembling a return in a half hour would be pushing the limit for me unless all you are dealing with is someone with a couple of W-2s.  Taking an hour or two for the same return for someone with kids that you have known the someone for years is probably not necessary either.  But then again, I have been doing this for 40+ years and am set in my ways.  I'm not going to judge anybody for not taking enough time or taking too much time.  We each have our own practices and we each do what we think is necessary.