Sorry, I'm lost at the "two separate calendars" part. I can set the options for 7am start, 7pm finish, 12 hrs/day for the "first" calandar; I also changed "timescale" to "hours." This sort of gives me what I want, but I can't figure out how to have, say, "Task 1" start at 7 am and end at 2 pm on the same day. I don't know how to set up the "second" calendar unless you're talking about a separate schedule file which doesn't make sense - I want 2-12 hr/shifts to appear on one Gantt chart - Thanks.