Why does MySQL use an interval of 7 days and 2 hours instead of 7 days and 2 hours?

The reason behind this concept is that MySQL requires the unit keyword to be singular, regardless of English grammar rules. If we try to provide intervals of 7 days, 2 hours, etc. then MySQL will generate a syntax error as shown below -

mysql> Select '2017-02-25 05:04:30' + INTERVAL 2 days;
ERROR 1064 (42000): You have an error in your SQL syntax; check the
manual that corresponds to your MySQL server version for the right
syntax to use near 'days' at line 1

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