Requiring a ton of work doesn't really matter one way or the other for copyright. Mowing the lawn is a ton of work. Doing the work doesn't let you prevent other people from mowing their lawn to the same height as yours.
The EU narrowly rejects "sweat of the brow" copyright for recreations of public domain visual art [1]. I have no idea whether the same applies to font faces, public domain non-visual art, or phone books, but I'm assuming that it doesn't.
[1] https://en.wikipedia.org/wiki/Sweat_of_the_brow
[2] https://en.wikipedia.org/wiki/Feist_Publications,_Inc.,_v._R....