Compound of 幾 (how many; some) + 日 (day). Has a literary or slightly formal feel and most often appears in the pattern 幾日も (for many days). In casual everyday speech, use 何日 for 'how many days?'
Common collocations
- 幾日も: for many days; day after day
- 幾日過ぎる: many days pass
- 幾日も前: many days ago
Similar words
- 何日: how many days; what day — everyday standard form
- 幾日間: for how many days
- 数日: several days — neutral, common in writing