你好，朋友。你的句子有问题。难怪你纠结，呵呵。
你的句子是错句。这才是原句：They didn't realize they actually put in a destination back on the West Coast where they lived until they had driven for thirty minutes.
强调句：
It was not until they had driven for thirty minutes THAT they realized they actually put in a destination back on the West Coast where they lived until they had driven for thirty minutes.
或者（非强调句）：-------原理：从句在前。
Until they had driven for thirty minutes they didn't realize they actually put in a destination back on the West Coast where they lived until they had driven for thirty minutes.
或者（倒装句）：
Not until they had driven for 30 minutes did they realize they actually put in a destination back on the West Coast where they lived.
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