Though presumably he's just looked at his statement and seen all six charges for the first time.
I certainly don't check my account every day.
Yes, if he's reported it the first time he saw it then that would be fine (even if that's on a traditional paper statement at the end of the month if not using online banking). I read it, possibly incorrectly, as saying that he had been watching it.
The key is to report it as soon as you reasonably can after seeing it and you will, provided you are not responsible (e.g. by leaking your PIN), have it fully refunded in due course. If it's your debit card and your only source of funding so you'll really be stuck without, you may want to take some cash out first, but do it quick.
I've got too used to Monzo where I'm notified of every transaction as it occurs!