Here are my estimates:
Villa: 20,000
Groceries 2,000
Eat out 1,500
Entertainment 750
Club Membership 750
Utils 1,000
Maid 1,000
Misc. 1,000
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Total 28,000
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This is if you are living an upscale (non-Qatari) life here. You can still save 17,000. Easily....