User blog comment:Lord Zeref Dragneel/Top 25 most powerful characters/@comment-25111584-20150812160455/@comment-1153699-20150813214059

@Jakuho -> The way I see it, 3 months of intense training / Second Origin gives about the same improvement as 7 years of casual training (taking missions, going on vacations, staying active etc) for the most part.

Gray and Lyon are a proof of that. Both of them were around the same level during the OS arc and that didn't change much if at all during the GMG. Max and Natsu are another example. Before SO, Natsu was getting overpowered by Max. But after he got SO, Natsu was able to easily ragdoll Max around without even going anywhere near all out (just like he always did to people on Max's lvl before the x791 arc).