For a game that relies on real-time strategy to play, when would be the best time to calculate interest on the players bank account?

For official banks, some would have an annual interest rate of about 9.5%. So is it feasible, for a daily calculation, to have an interest rate of (9.5 / 365)% ?

Would daily be too much? Players waiting for a weekly (I think monthly is way too long) might want a more immediate action to their money.