Properly sealed A/C systems should never need a recharge. If the compressor is running then you'll first need to recharge THEN find the leak so you don't have to recharge every few months.

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Currently
2012 X5: BSM/Black/Sport Activity/Bel STi-R Plus

So Long!
2013 M3: JZB/Black/ZCP/M-DCT
2010 Audi S4: Deep Sea Blue/Black/Prestige/S-Tronic/Full ADS
2006 BMW 330i/Jet Black/Black
2005 Audi S4/Moro Blue/Black