I keep mine on all the time. This does tend to wrinkle and tear the dust jacket though, so if you're really persnickety about your dust covers you might want to do what alot of the folks here have all ready said. Off while reading, on while on the shelf.

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Donald Jacobs
Marysville. WA
Cascade Church (CRCNA)

Cum vero infirmor tunc potens sum.