Timeline?

TOS - 80 episodes at average length of 50 mins = 4000 mins

TAS - 22 episodes at average length of 22 mins = 528 mins

TNG - 177 episodes at average length of 45 mins = 7965 mins

DS9 - 173 episodes at average length of 45 mins = 7785 mins

VOY - 168 episodes at average length of 45 mins = 7560 mins

ENT - 97 episodes at average length of 45 mins = 4365 mins

Motion Picture - 132 mins

Wrath of Khan - 113 mins

Spock - 105 mins

Voyage Home - 122 mins

Final Frontier - 106 mins

Undiscovered Country - 110 mins

Generations - 118 mins

First Contact - 111 mins

Insurrection - 103 mins

Nemesis - 116 mins

Star Trek (2009) - 126 mins

Into Darkness - 133 mins

Total hours of viewing time - 560

Average viewing pace of 3 hours per week = approximately 3.5 years to completion