I had in mind a combination of the Cambridge Summerville youth study, the massive body of research that working more hours isn't good for productivity, and the (admittedly currently ongoing) research into personal relationships which is showing a marked improvement in relationship outcomes for couples who live together before getting married.
A YEAR! MF! That's meant to be long! FTS! A friend is someone you have validate of ten or twenty years of shared adventure. Treat everyone else as a possible friend (and likely tosser).