many moons ago

four score and seven years ago

Used (sometimes sarcastically) to indicate that a past event being mentioned is particularly important: a long time ago; many years ago.

have one's fingers in many pies

To be involved in many, or too many, different things.

many a time and oft

Frequently.

many happy returns

A greeting, usually for birthdays, in reference to the passing year; Happy birthday!

one too many

One or more servings too many of alcohol, leading to drunkenness.

too many balls in the air

Too many tasks, responsibilities, or details to cope with or manage successfully.

wear too many hats

To try to fill more roles at once than is realistically possible.