Maybe I'm just lucky, but out of the 7 or so times I've had a car die (O.K. 4-5 of those times were in a 914) I've been able to fix the car and be back on the road, all but twice. Once was a blown MAF sensor in a 1990 Reatta the other was when a concrete block fell off a truck in front of me and ripped the deep sump oil pan off my 914.
1. blown fuel pump fuse, figured it out, replaced it.
2. C-V joint bolts backed out, no limited slip differential so the free wheel spun until I took bolts out of other parts of the car to limp home.
3. Fuel pump fuse blew and continued to blow. Jumpered the pump till I got home, found out later to be a bad AAR shorting out the system, but I still got home.
4. Pushed in the clutch to shift and POP. Had an extra cable and a trunion. Actually found the old trunnion a few days later on the other side of the road (happened a few blocks from a friend's house).
5. Dash gauges went crazy, engine died, smoke from the interior as I unpluged the battery. A PO used masking tape/drafting dots for electrical contacts under the passenger seat. Shorted out the ing wire which killed the electrical system. Some liberal use of electrical tape and I drove home.
6. Fuel pump on my 90 Bronco wouldn't turn off, even with the key removed. Then it wouldn't turn on, 150 mile from nowhere. Swaped out the A/C relay and it was just a hot ride home but I made it. Without a multimeter I would have towed it.
I don't recomend the spares I mentioned flipently, IT IS FROM MY PERSONAL EXPERIENCE...." your results may vary
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...and yes the average time was at least a half hour to maybe two hours in nice weather, but then again when my oil pan ripped off it was thanksgiving day night and I waited 4 hours for a tow truck.
P.S. Germain.... go roll your eyes at someone else.....I didin't break a driveshaft, not on a 914 anyway. My 13 sec Lightning has a "driveshaft" safty loop for that. (front engine, rear wheel drive...drive shaft. Mid engine, transaxle.... half-shafts.)