One of the least plausible aspects of fantasy as a genre is that sorcerers NEVER seem to get bogged down in creating a new spell then spend the next three or four months muttering "I hate this, it's rubbish" under their breath.
@cstross
In Max Goldstone’s Craft Series magic is based on contracts, and all the fine print better be right or truly nasty unforeseen consequences might ensue.
And the really proficient and dedicated practitioners keep working and giving up aspects of their lives (sleep, relationships, recreation) and finally die, after which they really go to work.