In general: If something will happen in 1 to 7
Post# of 6857
If something will happen in 1 to 7 days, you can say we are “day to day”
If something will happen in 1 to 4 weeks, you can say we are “week to week”
If something will happen in 1 to 12 months, you can say we are “month to month”
IMHO