Thanks, that is a more general review than what I was able to find. I wasn't able to find anything agreeing with a half-life on the order of weeks, however. Is it possible you're mistaking the half-life of irreversible MAOI's (since it binds to the enzyme irreversibly, the half-life is essentially the lifetime of the enzyme, weeks) with reversible (minutes to hours), which seem to be the ones in coffee?

No; the study I remember looking at was about reversible MAOIs being stored in fatty tissues.