Different varieties have different times. I like my Burpee Fourth of July tomato because they really do ripen by the 4th. I've already had several BLTs! However, many varieties will take anywhere fro, 65 to 80 days to ripen. And once they get a blush on them a lot will depend on your weather. I've found they like warm days and cool nights to ripen the fastest. When it gets really hot and doesn't cool off at night they seem to slow down.
