Longest time span with blue eyes?

What is the longest time span that you have seen you BP stay with the blue eyes right before a shed?

My bp has been sitting now for a week with the blue pre-shed eyes in his hide.

I throw a warm new damp folded up paper towel in there every morning and mist.

mine usually clear up in 24 hours or so, and shed about 4 days later. One of mine must have a calendar or day planner or something, 'cause he goes opaque on the 12th every month for the last 3 in a row..