Netflix, ground zero of binge-watching, did a study.  This is how long it takes to start binge-watching a show, by episode:

• Arrow, Episode 8
• Bates Motel, Episode 2
• Better Call Saul, Episode 4
• Bloodline, Episode 4
• BoJack Horseman, Episode 5
• Breaking Bad, Episode 2
• Daredevil, Episode 5
• Dexter, Episode 3
• Gossip Girl, Episode 3
• Grace & Frankie, Episode 4
• HIMYM, Episode 8
• House of Cards, Episode 3
• Mad Men, Episode 6
• Marco Polo, Episode 3
• OITNB, Episode 3
• Once Upon A Time, Episode 6
• Pretty Little Liars, Episode 4
• Scandal, Episode 2
• Sense8, Episode 3
• Sons of Anarchy, Episode 2
• Suits, Episode 2
• The Blacklist, Episode 6
• The Killing, Episode 2
• The Walking Dead, Episode 2
• Unbreakable Kimmy Schmidt, Episode 4

This might explain why I had a hard time getting into Mad Men.  Six hour long episodes is quite an investment before a person gets “hooked”,