F-35 flight restriction update

How many years have they had to get this right?

The F-35 Joint Strike Fighter test fleet will be able to fly six hours between engine inspections for weapon test and refueling missions, as restrictions on the fifth-generation fighter continue to ease.

Previously, the entire F-35 fleet was limited to three hours of flight time before an engine inspection was required as an investigation continues into a fire that heavily damaged an F-35A model on June 23.

The test fleet is made up of 20 F-35 fighters. The remaining 79 F-35s are still operating under the full restrictions.

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-Time's Battleland - 5 Part series on F-35 procurement - 2013 
-Summary of Air Power Australia F-35 points
-Bill Sweetman, Aviation Week and the F-35
-U.S. Government Accounting Office (GAO) F-35 reports
-F-35 JSF: Cold War Anachronism Without a Mission
-History of F-35 Production Cuts
-Looking at the three Japan contenders (maneuverability)
-How the Canadian DND misleads the public about the F-35
-Value of STOVL F-35B over-hyped
-Cuckoo in the nest--U.S. DOD DOT&E F-35 report is out
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-F-35 Key Performance Perimeters (KPP) and Feb 2012 CRS report
-F-35 DOD Select Acquisition Report (SAR) FY2012
-Release of F-35 2012 test report card shows continued waste on a dud program
-Australian Defence answers serious F-35 project concerns with "so what?"
-Land of the Lost (production cut history update March 2013)
-Outgoing LM F-35 program boss admits to flawed weight assumptions (March 2013)
-A look at the F-35 program's astro-turfing
-F-35 and F-16 cost per flying hour
-Is this aircraft worth over $51B of USMC tac-air funding?
-Combat radius and altitude, A model
-F-35A, noise abatement and airfields and the USAF
-Deceptive marketing practice: F-35 blocks
-The concurrency fraud
-The dung beetle's "it's known" lie
-F-35's air-to-air ability limited
-F-35 Blocks--2006 and today
-The F-35B design is leaking fuel
-F-35 deliveries
-ADF's wacky F-35 assumptions
-Gauging performance, the 2008 F-35, Davis dream brief
-Aboriginal brought out as a prop
-Super Kendall's F-35 problem
-LM sales force in pre-Internet era