Sen. Tim Cullen's Proposed Bill for 21-Day Waiting Period for Legislation Introduction and Approval

At issue: Should future legislation have a waiting period before passage?  (Wisconsin State Journal, 9/2/2011)

Excerpt:
In a nutshell

A proposed bill being circulated by Sen. Tim Cullen, D-Janesville, would require a 21-day waiting period between legislation being introduced and approved by either the state Senate or the Assembly. The waiting period requirement could be suspended for individual bills by a two-thirds majority vote of either body.

The case for it

Cullen said the highly contentious budget repair bill, introduced in February by Gov. Scott Walker with passage originally expected within a week, pointed out the need for a waiting period. It caused Cullen and his 13 Senate colleagues to leave the state and hole up in Illinois to stall passage of the bill.

Under "the case against it" subheading, you can just imagine the reaction of the Republican Senate majority leader.

The question I have:  What percentage of bills are introduced and approved by either house of the state legislature within 21 days?