Does the delay in taking Slinda 75 minutes affect efficacy?

Good morning. I have already read a few threads on this topic, however, there are quite few of them and do not dispel my doubts. I am fresh after changing the complex contraceptive to the single-component drug Slinda. I took my first tablet on Saturday , when I write it is Friday or I finish the first week. I always took the preparation equally at 15:00, but today for logistical reasons I had to accept later (equally at 16:15). Is protection still maintained? The manufacturer recommends to take every 24 hours (what I try to do, never forget about the tablet even in the case of the previous preparation), the leaflet does not quite clearly suggest possible time spreads.