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Folio 27r from the Lindisfarne Gospels - likely by Eadfrith of Lindisfarne (715-20)
(upload.wikimedia.org)
Wander the gallery. Look at the art. Be polite. If you feel able please post some great art :)
Going from my wild uneducated guess (Wikipedia) it looks like about 5 years... and potentially 1 artist. Then again they lived on a solitary island doing nothing else, apart from the occasional shelter from viking raids.