Checking a hotel price exactly once, at the moment of booking, means missing essentially every price movement that happens afterward — which, as covered elsewhere, tends to be concentrated in the ten days before check-in. On the other end, checking obsessively multiple times a day adds effort without adding much benefit, since most rates don't move meaningfully within a single day.
Once a day lands close to the practical sweet spot for most stays. It's frequent enough to catch the vast majority of meaningful price movements before a cancellation deadline closes, without turning price tracking into a source of daily anxiety or a habit that eats real time out of your day.
The exception is the final 48 hours before check-in, where last-minute discounting is more likely and more time-sensitive — if a rate is being actively tracked and the deadline is close, a slightly closer eye in that specific window is reasonable, even if daily checks were enough for everything before it.
This is, not coincidentally, exactly the cadence an automated daily check is built for — frequent enough to catch what matters, infrequent enough to not need to think about it, with an alert only firing when there's actually something worth acting on.
