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If Thor could ko Hulk with Mjolnir he'd have done so by now.
Thor has shown he can do it on numerous faar more powerful beings than Hulk, so Hulk is not an exception.
Thor has never tried to hit the Hulk with Mjolnir in faster than light speed-end of the Hulk-that's what is called not holding back out to kill, the way Thor usually fights because of his pride against the Hulk, if Thor is fighting the Hulk like he does against faaar more powerful beings than the Hulk-which means smart, Hulk is simply dead before their fight even starts.