https://www.project1999.com/forums/s...ad.php?t=92423
It was quite a while ago, but Loraen tested that even at 200->250 there was a noticable change in charm durations, and suspected that it would be twice as big a change up to the 200 suspected softcap.
I'd like to again draw the charm naysayers' attention to Loraen's results compared to the results of this 58 enchanter on live. Loraen only has 2-minute and under averages WITH tash against a level 53 mob. -7 mob, with tash, shorter durations than the 58 guy on a -8 mob without tash. It was only when fighting a VERY low blue (it was the minimum blue con for a level 60, -14 levels!), with tash, that Loraen had a big average charm duration.
Believe it or not, I'd even be willing to concede, with just a little more data from here about low-blue/high-green charm durations, that those need a nerf. But a level 50 keeping an imp charmed for a whole naggy on here is definitely not out of line with the data we were just seeing from live, classic-era charm tests. I mean, Loraen was seeing 7-minute average durations on a -14 with tash only, compared to Wandatin at 58 charming a high-green seafury and no tash but only having 2-3 minute average. But still. That's not really conclusive even then without more info from p99 imo.