The ball oven is designed to stay under a certain temperature. I think there is also a mechanism that distributes the heat evenly. With the hot car, you don't know how hot it is, and you may not know how long it will be in there. I think the hot car taboo is really about bowlers who would just put their bowling gear in the trunk at the start of the season and leave it there until the season ended. In southern New England this wasn't a really big problem unless you joined a summer league.
I think the balls can stay in until they stop bleeding. Your best bet would be to ask your friend at the pro shop. The manufacturer might be much more cautious than necessary.
p.s. the last two weeks just the 20 minutes ride to the alley with the balls in the back of a pick up with a cap has been enough to start sweating oil out of my lefty HyRoad.
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