Measure the current draw to be certain.
I assume that you have a separate earth wire, disconnect that and put your current meter there (in place of the earth wire). [The earth wire is the safest wire to disconnect.]
Should be 0.
If not then you can calculate the hours taken to flatten your battery. Take the amphours of your battery (usually abbreviated to AH) and halve it (you need at least half the charge to start the bike), say it is 20AH, so the number you use is 10. Divide that by the current you measure, say it is 10mA .. the m means milli means 1/1000 A means Amperes, so teh number you use is 10/1000 = 1/100. Calculation is 10 / 1/100 = 10*100 = 1000 hours. Divide that by 24 to get days .. roughly 40 days. This calculation neglects any out currents drawn by the rest of the bike.
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