Compared to regular or 3.5h core E3, the extended variant leaves time for extra SWS incurred by heavy exercise, and is less likely to hinder muscle building and growth. The adaptation process is also much more forgiving than the regular variant, as it has a much higher total sleep time. The extended core would often allow all SWS to remain intact during adaptation, thus preventing much SWS from seeping into naps or the end of the core. This makes adaptation to this much easier than to regular E3.
