If you select "Weeks" instead of days, be sure to consider using the "+1 Day" tickbox to prevent overlapping rules, which could cause a conflict in the Channel Manager.\
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For example, if one rule covers one week (1-7 days) before check-in, ticking this box for the next rule, 1-2 weeks (7-14 days) will shift it to 8-14 days, preventing any conflict if the guest books exactly 7 days before check-in.