Review Log elapsed days confusion

I'm trying to write a test for review logs for the Rust library and I'm using this library as the source of truth. However, when I generate logs, the elapsed_days isn't making sense to me.

Here's my quick and dirty code:

from datetime import datetime
from src.fsrs import FSRS, Card, Rating
import random
from rich import print

fsrs = FSRS()
card = Card()

ratings = (
    Rating.Good,
    Rating.Good,
    Rating.Good,
    Rating.Good,
    Rating.Good,
    Rating.Good,
    Rating.Again,
    Rating.Again,
    Rating.Good,
    Rating.Good,
    Rating.Good,
    Rating.Good,
    Rating.Good,
)

now = datetime(2023, 4, 18)
logs = []
for rating in ratings:
    scheduling_cards = fsrs.repeat(card, now)
    card = scheduling_cards[rating].card
    log = scheduling_cards[rating].review_log
    logs.append(log)
    now = card.due

for log in logs:
    print(vars(log))

Here's the output:

{'rating': <Rating.Good: 3>, 'elapsed_days': 0, 'scheduled_days': 0, 'review': datetime.datetime(2023, 4, 18, 0, 0), 'state': <State.New: 0>}
{'rating': <Rating.Good: 3>, 'elapsed_days': 2, 'scheduled_days': 0, 'review': datetime.datetime(2023, 4, 18, 0, 10), 'state': <State.Learning: 1>}
{'rating': <Rating.Good: 3>, 'elapsed_days': 7, 'scheduled_days': 2, 'review': datetime.datetime(2023, 4, 20, 0, 10), 'state': <State.Review: 2>}
{'rating': <Rating.Good: 3>, 'elapsed_days': 21, 'scheduled_days': 7, 'review': datetime.datetime(2023, 4, 27, 0, 10), 'state': <State.Review: 2>}
{'rating': <Rating.Good: 3>, 'elapsed_days': 58, 'scheduled_days': 21, 'review': datetime.datetime(2023, 5, 18, 0, 10), 'state': <State.Review: 2>}
{'rating': <Rating.Good: 3>, 'elapsed_days': 145, 'scheduled_days': 58, 'review': datetime.datetime(2023, 7, 15, 0, 10), 'state': <State.Review: 2>}
{'rating': <Rating.Again: 1>, 'elapsed_days': 0, 'scheduled_days': 145, 'review': datetime.datetime(2023, 12, 7, 0, 10), 'state': <State.Review: 2>}
{'rating': <Rating.Again: 1>, 'elapsed_days': 0, 'scheduled_days': 0, 'review': datetime.datetime(2023, 12, 7, 0, 15), 'state': <State.Relearning: 3>}
{'rating': <Rating.Good: 3>, 'elapsed_days': 10, 'scheduled_days': 0, 'review': datetime.datetime(2023, 12, 7, 0, 20), 'state': <State.Relearning: 3>}
{'rating': <Rating.Good: 3>, 'elapsed_days': 24, 'scheduled_days': 10, 'review': datetime.datetime(2023, 12, 17, 0, 20), 'state': <State.Review: 2>}
{'rating': <Rating.Good: 3>, 'elapsed_days': 53, 'scheduled_days': 24, 'review': datetime.datetime(2024, 1, 10, 0, 20), 'state': <State.Review: 2>}
{'rating': <Rating.Good: 3>, 'elapsed_days': 112, 'scheduled_days': 53, 'review': datetime.datetime(2024, 3, 3, 0, 20), 'state': <State.Review: 2>}
{'rating': <Rating.Good: 3>, 'elapsed_days': 224, 'scheduled_days': 112, 'review': datetime.datetime(2024, 6, 23, 0, 20), 'state': <State.Review: 2>}

For the second review, it says the elapsed days is 2, but the review dates are on the same day just 10 minutes apart. This isn't expected behaviour, is it?

open-spaced-repetition / py-fsrs

Review Log elapsed days confusion #15