last entry time; last check-in time
Wasei-eigo from English 'last in'. Used in contexts like hotels, events, or facilities to indicate the latest time one can enter or check in.
wasei-eigo (Japanese-coined English), from last in
このホテルのラストインは深夜2時です。
The last check-in time at this hotel is 2 a.m.
イベントのラストインは開演の30分前までとなっております。
The last entry time for the event is 30 minutes before the start.
Variant with interpunct; less common in running text.
Wasei-eigo (Japanese-made English) from 'last in'. Not used in English with this meaning.