The development of this tool took me 12 hours, maybe more.
Even considering that I can be tired, slow and rusty with VB.Net,
I could develop it in 8 hours.
8 hours is a working day for which an employee could earn € 60 / € 80, maybe more.
Of course, this is not a required work by a boss. But this will earn me € 0 and apps, including the percentage for Google, taxes and costs for the movement of money, make you earn almost as much (except for rare cases).