OSRIC p. 36:
Spell memorisation requires a minimum rest period of 4 hours, which must be spent in a quiet place without interruption.
DM: I think we can we memorise our spells in the morning, cast them, and then rest again mid-day for 4 hours, and then cast again in the evening.
What say you?
If so, we can probably get away with a single day.
Qadar, I'm not sure that casting Identify is necessary, as long as we can separate magical from mundane.
Besides, Identify looks pointless at first level: 20% chance to gain an insight into an item.