How big does a Glyph of Warding need to be? Its description says:
When you cast this spell, you inscribe a glyph that later unleashes a magical effect. You inscribe it either on a surface (such as a table or a section of floor or wall) or within an object that can be closed (such as a book, a scroll, or a treasure chest) to conceal the glyph. The glyph can cover an area no larger than 10 feet in diameter
It has a max size of 10ft but what about a minimum? If I had a single piece of standard paper, is there any guidance on how many glyphs I could fit on it?