Fifty minutes continuous talk-time
Yes, that's right FIFTY CONSECUTIVE CONTINUOUS BLOODY MINUTES! Pardon me shouting, but WTF?
How much effect was there after five minutes? Ten? Fifteen? None, I'd wager.
What is the statistical distribution of call duration and inter-call gaps: whatever it is, I'll bet the median - and probably the ninety-somethingth percentile - is nowhere near fifty minutes talk time.
Next thing, they'll 'discover' that if you drink three bottles of high-proof vodka, neat, one after the other without stopping, that it appears to have some potentially deleterious effects on health.
FAIL, completely, utterly, absolutely, totally FAIL