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in 2x20 the interval is done at a level of effort you can maintain for 20 minutes. It's not like you start sprinting at the start and try and hold it for 20 minutes.
For an endurance event, i.e. like a 12 hour race, they are exactly the kind of interval that should give you the most bang for your buck. Shorter ones, probably not so much.
andyp-
Always happy to be corrected by @andyp
youramericanlover
Could be good. What sort of interval sessions do you have in mind? People talk about the 2x20 for endurance intervals but 20 mins seems like a loooong time for an interval. I've only ever really done 40x20: 10 min warm up and then 40 seconds on, 20 seconds off for 10 mins, 3-4 min recovery, then 40 on 20 off for 10 mins, 3-4 min recovery and then either try another one and fail in the middle of it or stop knowing I would probably fail in the middle of the third set, 10 min recovery. Of course by all means do 3 or 4 or 5 sets if you love it.