"Copying a Spell into the Book. When you find a wizard spell of 1st level or higher, you can add it to your spellbook if it is of a spell level you can prepare and if you can spare the time to decipher and copy it.
...
For each level of the spell, the process takes 2 hours and costs 50 gp.*"
* 10% off on #fountainpenday at some retail outlets