A meta description that runs too long

You can write too much here, and this page proves it.

Where the snippet gets cut

The description is shown in a fixed width and cut off with an ellipsis, usually somewhere around 150 to 160 characters. Everything past that point does not appear in the result. If your reason to click is at the end of a long description, it will not be seen.

Keep it to one line

Put the most important point first, keep the whole thing to a single sentence, and stop before the cutoff. If you find yourself joining three ideas together with semicolons, that is two descriptions competing for one slot.