This week I’m discussing another word in that same vein — half.
Here we see another example of the distinction between spoken and written English. When spoken, the article a or an often follows half. In speech, this use has found broad acceptance.
However, this use is colloquial. Thus, when used in writing, half a and half an invite less formality than what more effective technical writing requires. This means the writer should revise the example sentence in the cropped graphic above. Here are two alternatives, both of which are acceptable.
The weld took half a minute to fabricate.