Most small businesses benefit from checking their cash position weekly and reviewing it in more depth monthly. Weekly gives you an early warning of a shortfall while you still have time to act; monthly lets you compare what actually happened against what you expected and see whether a pattern is forming.
Daily monitoring makes sense in some situations — during a tight period, while you are waiting on a large payment, or in a business with high transaction volumes and thin margins. The point is not the frequency itself but whether you spot problems early enough to do something about them.
A useful review looks at more than the bank balance. Check what is due in and when, what is committed out, how your debtor days are trending, and whether any customer is slipping consistently. A single large balance can mask a real problem.
Set a fixed slot for it. Cash flow reviews are the first thing to get dropped when a business is busy, which is usually exactly when they matter most.