Ferrari battery

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I've only owned my 550 for a couple of months, but hopefully those of you who have run a ferrari longer could answer this one;

I bought a trickle charger for it recently and on Friday plugged it in for the first time. It took about 10 hours to fully charge it from whatever charge it had in it to start with. Thought I'd try an experiment over the weekend and not plug it back in until late this afternoon after some local motoring over the weekend - I drove the car for about an hour over the two days and started the car 5 times. On plugging it back in this afternoon, I noticed it was still charging after 6 hours. Is this normal or perhaps an early sign of a failing battery or perhaps failing alternator? I guess a lot of battery power is required to turnover a v12 from cold, but wouldn't have thought it needed 6 hours and still going after being used as it was

Thanks in advance