Your poem is really sweet... It is deep and has a lot of emotion in it...
The metaphor of "cash" is intersting... I would never think of relating time and money, though...
The flow is a little bit off in a couple stanzas that became too long, but it is not a big problem...
The contrast with the title ("long letter"/short poem) is also very nice...

*keep on*
isabel

5/5. I'm no sap, but this poem was full of emotion. Quite powerful. I like how your poems progress and culminate, with each stanza differing from the one before it. So good... I'm going to look at some others of yours and maybe add you to my favorites :)