Extend the Life of a Target Visitor Profile - Please

I recently learned that the lifespan of my data in the Adobe Target visitor profile is a max of 90 days (default is 14 days).  This is too short!  I work in a business that drives toward one day a year - we have one transaction per client per year, but their likely-hood to convert similarly year over year is very high.  Can this lifespan be extended to a max of at least 12 months (24-36 would be amazing)?