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I believe this is the study for those interested. I’ve not actually read the paper but table 2 gives the training durations of the different plans (6-7hrs/week)
That said, the effectiveness of a polarised approach for low volume training is something I think needs more exploration. Personally @10hrs/week I try to adopt a polarised approach with 2 intensity sessions during the week (~90tss with work at FTP or above) with longer (2+hr runs, 3-4hr bike) zone 1 sessions on the weekend.
Soon I’m going to have to cut my overall volume so I’ll probably loose some of the longer weekend sessions and add in another high intensity day.
At least one study suggests ... yes.