幾日

1. Origins, structure, and basic meaning

• Structure: 幾日 (いくにち) is a day-count expression meaning how many days or an unspecified several days.
• Basic usage: 幾日かかるか asks for the number required, while 幾日も stresses continuation over several days.

2. Common pitfalls and similar expressions

• How many or several days
  • In a question it asks for a number of days; with a quantity marker it can indicate an unspecified several days.