Too much time. Yes! Sometimes it is. "What could possibly go wrong???" - upon diving into a project on an old car something almost always rears up and causes a bigger time commitment than first imagined (especially when you're learning). Or, just when you fix one then something else breaks. I had a lower ball-joint replaced by my indy a little while ago and a day after I got the car back I noticed my expansion tank had developed a slight crack along the bottom. Not a big problem, but time consuming nonetheless. Today I replaced my battery tray, cleaned the drain holes, and did some rust preventative measures - fun things, but still time. I bought my car in September and I've only driven about 1000 miles, but so far, I'd say I've averaged about 8-10 hours a month working on my car (this includes hours for my indy's work). Is this figure average? you tell me.

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1984 300D, 228k, Light Ivory, Java MB-Tex