If it's a group/pair that answers I will cut them off and try to mimic them. If they answer right away to that, I will switch to pup distress.
I usually try to howl a few times to start every stand and sound like a very friendly, lonely coyote. Not uncommon to not get a response until my second howl of the stand though. I usually don't worry if I don't get a response in the daytime, it's cool when they do, but most come in silently to check things out.
I get the most responses at night (I expect responses at every stand at night, but I call differently at night), early morning or evening is probably a toss up.
Some fun public land stories for motivation - I got a response from a pair a mile north, on an evening stand (answered every howl, but never moved in an hour - but really didn't expect them to cross the road to come in). First day that the wind was good I snuck in about 300-500 yards away from where I had herd them. Answered my first howl and charged in when I cut them off. Didn't have time to do anything else.
Favorite stand of all time - First time I took my wife out, when she had a gun in hand. Snuck in to a wide open snow covered field, along a creek bottom about mid morning. On the second howl they responded from the creek right in front of us (they did the thing where it sounds like there are 20 angry coyotes in there). Cut them off, they were more pissed now, then did some pup distress. Watching those three coyotes run straight to us, across the flat wide open field was one of the coolest things I have ever seen.
Second favorite stand - My buddy hadn't been calling in years (moved away for work) and called me up wanting to go. First spot walking in I could see three coyotes about 1000 yards away messing around (snow cover). Had him sneak about 75 yards in front of me. I howled, they answered, I cut them off they started running straight for us. Took them a few minutes to work their way across this swampy flat bottom, so I gave them some pup distress to keep them running. He shot two of the three at about 25 yards.
Now I'm excited for the season! Hope to do a lot of calling in the next couple of months.