1 day off each week, it might vary by week depending on the crew. Most team leaders will try to ask what day off you prefer and try their best to give it to you.
Shifts vary a lot:
Open = 9:25am (except for bigger coasters with ERTs, etc.)
Maybe until 6pm, 8pm, or Close (just like it sounds!)
Split shift: Open-1:30pm, then the afternoon off, back at 6pm until close.
This is pretty general, because a lot of the rides (mostly the bigger coasters) will vary the shifts to accommodate the long lines at the end of the day, since you'll be there longer.
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PO!NT OF VIEW - A Different Look at Roller Coasters
http://www.crosswinds.net/~justmayntz/thrills/