This is a real shitty way to declare you love someone. I mean. On one hand, it’s got just the extremity of high numbers and hyperbole that we expect from lovers.
It’s got some quality of Juliet’s love being as boundless as the sea. Love is big! Love is out sized! Love is forty thousand times love!
But it’s not just the standard hyperbole of lovers – it’s comparative. It’s saying my love is 40,000 times bigger than yours, Laertes.
Which is just dick measuring but with love.