Although the banner heading does state 51 time longer, further down in the smaller text is says 51m longer.
Does no one proof read newspaper articles any more?
They probably do via a spell checker which does not pick up any grammatical errors and the like.
Not to mention that the proof reader also has to be literate.
Books used to be dumped if found to be incorrect, now they just still sell them.
It even occurs in academia, slack standards, as anything now goes.