[AccessD] Field Sizes

I've got bigger problems right now, but I've meant to ask something
forever and...well...today is the day, I guess. What do y'all use for
standard sizes for typical text fields, such as Last Name, First Name,
Address, City, etc.? Is there a "common practice rule" concerning this?

And, just to get the yuks outta the way, I guess I could have changed
the subject line to, "does size matter?"