Honestly, the fact that Silver Surfer's MFTL+ is only listed at 4.2 million c is ridiculous, even many of the feats currently on his profile are much better than that.
(
Flew through 500,000 light-years in a short timeframe.
Flew galactic distances in a panel.
Crossed the universe in minutes.
Searched through the entire galaxy in seconds.
Visited every planet across numerous galaxies in hours)
For the first one, even if we
seriously lowball it by assuming it took 12 full hours to cross 500,000 light years, that's still 365 million c.
For the second one, even if we, once again, massively lowball this by assuming he only travelled 50,000 light years in the panel and that it took him one minute (both of which are super generous assumptions), this puts the speed of the feat at 26.28
billion c.
The third one is an already-accepted calc of 105 trillion c.
The fifth one is a calc with two possible ends, one at 875 trillion c and another at 1.47 quadrillion c.