If you spent $50 on a pair of shoes.....

[LimeSlice]

Depends on what they are and where they were being worn.
A pair of $50 boots in the kitchen would last me a month if I bought a shoe without a decent sole that is resistant to damage from fats, oils, acids and solvents. But that same shoe would last me easily 12 months if I wore it hiking 8 hours a day for a year.