It's not something I made up, it's a long time believe by many hockey people. I first heard in the 1990's in an interview with Larry Robinson... I again heard it from Scott Stevens in person. I also heard Lou make similar references many times....but it's been repeated many many times.
It's widely talked about just Google it.
Dale Talon: "In my opinion it takes defencemen 300 games to become totally comfortable"
Dale Tallon played a key role in building up both the Chicago Blackhawks before their championship years, and the Florida Panthers before their young core took off.
www.sportsnet.ca
"The "200-game mark" is widely accepted in NHL circles as the standard threshold for a defenseman to fully adjust to the pace, physical demands, and tactical complexities of the league. Prior to this milestone, blueliners are largely learning the ropes and are prone to developmental growing pains."
"The 200-game (or roughly \(2.5\) full regular seasons) threshold acts as a vital developmental anchor in the NHL. It represents the point where a blueliner has endured enough repetitions against elite competition to build the spatial awareness and situational recognition needed to consistently mitigate risk in the defensive zone."
Breakout Threshold (BT) – Using Career Games Played to Determine Breakout Potential. Dobber Hockey
Co-written by Mat Porter *Usually posted in the Fantasy Guide, but moving forward the Fantasy Guide will link here for reference. Order the Fantasy Guide here. Back in 1997, in a fourth-year university Mathematics class project, I analyzed 15 years of data to
dobberhockey.com
"Some skilled defensemen of average size may also use this 200-game BT as well.
Bigger defensemen and exceptionally-sized forwards need 400 NHL regular-season games. We define 'exceptional' here as 5-9, or 170 pounds or less, on the small side, while on the bigger end we use 6-3, 215 pounds, or more."