This is a typical firing schedule for a bisque firing in a manual kiln.
Bottom switch on low for several hours if necessary (candling).
Turn on all switches to low for 3-4 hours.
Turn all switches to medium for 3-4 hours.
Turn all switches to high until kiln has reached temperature.
(Note, if your kiln has multiple sections, you may turn them up individually if you want slower heating.)

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