A production line at V. J.​ Sugumaran's machine shop has three stations. The first station can process a unit in 8 minutes. The second station has two identical​ machines, each of which can process a unit in 12 minutes​ (each unit only needs to be processed on one of the two ​machines). The third station can process a unit in 5 minutes.

Station 3 Station 2 Station 1 is the bottleneck​ station, with a bottleneck time of nothing minutes per unit ​(enter your response as a whole​ number).
Which station is the bottleneck station?