The first meaning of this determiner which probably concerns this topic is: 1. one more; an extra thing or person And below the first meaning is written help:
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Another can be followed by a singular noun, by of and a plural noun, or by a number and a plural noun.
When you see 'another' in front of any period of time - day/year/20 minutes/14 days - the period of time mentioned is regarded as a single unit. So, 20 minutes is not seen as individual minutes, but a single length of time:
"The judge had already sentenced her to 14 days in prison, and then when she swore at the judge, he gave her another 14 days for co