[Mark Postle]

Matze,
Sounds like you’ve got this figured out but yes in this example your AeT would be 135. Any aerobic capacity work should be done below this number and pace adjusted as needed. One thing that is very common for me for these 2 hour sessions is I will start out in lower Z2 (around 125 for example) and with some natural drift over the course of the 2 hours I will finish at the top of zone 2. This will result is fairly even pacing over the workout duration and not much need for slowing to keep HR in Zone 2.