MAP is roughly your 5-min power at VO2max, Coach Chad briefly discussed this in the first VO2Max deep dive (podcast 189, starting at 29:30). Notes here:
I’ve heard other coaches say 6-min power, but for myself MAP is a ceiling on 5-min max effort. In other words, I’ve never been able to do MAP for 5-min. My best max effort was ~4-min at MAP. Perhaps that is partly because I’ve only targeted 4 to 4.5 minute max efforts, or 7-9 minute max efforts.