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I think more than 35k, just count the rewards in the Deercoffe post to which the ones guaranteed by the first four kills of the bosses must be added before the card is unlocked. Very rough calculation, sorry but I don't want to start doing the count now :)

It's 45,000. There are 45 quests in total. If you google dirty league event there's a page with the quest details for pussy market and named events, but if you don't spend any money, you will not be able to complete all of the quests because the quests got ridiculous. You simply won't have the time to complete all the quests. It may be possible if you play this game 24/7 but that's not realistics.

Edit: If you scroll up, Deercoffee posts details of the quests and the cumulative silver coins that you can earn by completing the quests. After the last quest you will have 45,000 from completing all quests alone.