Update GOVERNANCE.md

clarifying the provisional period

Author: earth2marsh

GOVERNANCE.md

@@ -20,7 +20,7 @@ Roles:
 
 ## 2. Adding members to the TSC
 
-A call-for-nominations period may be agreed upon by the TSC voting members and announced in a timely manner on a weekly TDC call (and documented on the agenda issue), assuming the TSC membership is not already at its maximum. A candidate may be nominated through a motion by a voting TSC member in a closed TSC meeting. A nominee must not receive opposition votes of more than 25% of the TSC voting membership via a confidential vote held electronically within a week following the nomination meeting. Approved nominees become provisional members and are expected to comport themselves as full members of the TSC during the provisional period of 4-6 weeks (to be determined at start of each nominating period), though nominees have no voting rights. The provisional period is concluded by a second, confidential vote similar to the nomination period's vote. At most there are four voting periods per year (no more than one every three months), with a minimum of one per year.
+A call-for-nominations period may be agreed upon by the TSC voting members and announced in a timely manner on a weekly TDC call (and documented on the agenda issue), assuming the TSC membership is not already at its maximum. A candidate may be nominated through a motion by a voting TSC member in a closed TSC meeting. A nominee must not receive opposition votes of more than 25% of the TSC voting membership via a confidential vote held electronically within a week following the nomination meeting. Approved nominees become provisional members and are expected to comport themselves as full members of the TSC during the provisional period of 6 months. The provisional period is concluded by a second, confidential vote similar to the nomination period's vote, after which newly confirmed members gain their voting rights. At most there are four voting periods per year (no more than one every three months), with a minimum of one per year.
 
 ## 3. Removal of membership from the TSC