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Well considering the DHF spent around this amount on a rally car for "marketing purpuses" over the last couple of years. ,I don't see how anyone can argue against you.

Considering you work ~160h a month. I'm developer of rust library and it took several days to get it into usable state. You won't work on it for 1920 hours, so why would you get paid for that amount?

If it takes hundreds of hours implement a bunch of operations, then maybe you are not fit to the task of developing it.