Welcome to English Forums, Guile. -- 'Many a' ('many' as a predeterminer) can be used sometimes for literary or rhetorical purposes; it is not a common current formation. The other is a commoner formation: ' too long a day', 'so busy a schedule', 'too big a mess', etc.
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GuileWhat do you mean by the word "mind you".
Guile"Many a great ..."Many a is possible with a singular countable noun: "It's been the ruin of many a poor boy and *** I know I'm one."
If this is correct, when do you use this?