十日

1. Origins, structure, and basic meaning

• Structure: 十日(とおか) means either a duration of ten days or the tenth day of a month.
• Basic usage: It marks duration in 十日が過ぎる and a calendar date in 六月十日.

2. Common pitfalls and similar expressions

• Special reading
  • This day expression is read とおか, not by simply combining the regular readings of 十 and 日.
• Duration and date
  • Translate it as “ten days” for elapsed time and “the tenth” when it follows a month.