Full Idea
If it is said that time flows, then it seems that the question 'how fast does it flow?' is a devastating one for the A-theorist.
Gist of Idea
If time flows, then 'how fast does it flow?' is a tricky question
Source
J.J.C. Smart (The Tenseless Theory of Time [2008], 5)
Book Reference
'Contemporary Debates in Metaphysics', ed/tr. Sider/Hawthorne/Zimmerman [Blackwell 2008], p.235
A Reaction
This is one of the basic landmarks in any debate on time. Time can't be understood by analogy with anything else (such as a river) it seems.