I don't recall a maturation period for redemptions, but I may have missed it.  From this copy of an earlier factsheet, it seems the early redemptions just had an additional 1.5% fee, although it also notes redemptions were on a "limited basis."

*Redemption of shares will be allowed on a limited basis
as of April 2014 with expectation of qualifying for public
trading of the shares via the OTCQX® under the Alternative
Reporting Standards. Please note that an early redemption
fee of 1.5% will apply if shares are redeemed within a year
of purchase.:

http://bitcointrust.wpengine.netdna-cdn.com/wp-content/uploads/2015/03/Fact-Sheet_Mar15.pdf