On standard BL-5J? and that is supposed to be bad result?

If Your battery would still have 1250 usable mAh capacity (which it doesn't have, trust me on that), it would mean that for 12 hours You've used 213 mAh.

After simple calculations, it is 17 mAh per hour. Sure, totally idle device set up to be 100% power-save savvy, with only GSM on, eats 6-8mAh per hour. But, as You've said, it wasn't absolutely ideal idle.

With screen turned on, "ideal" N900 eats 100 mA idle. touching screen result in another ~40 mA power consumption. Doing anything on it, above simply tapping screen for fun, result in even more energy used. Considering all of this, Your result is absolutely in line with what would be expected.
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If You have doubts, You can still submit what I've requested (powertop output).

/Estel