随時

1. Origins, structure, and basic meaning

• Structure: 随時(ずいじ) refers to occasions as needed or desired, rather than one fixed time.
• Basic usage: It suits notices welcoming questions at any time or updating information as circumstances require.

2. Common pitfalls and similar expressions

• The contextual scope of any time
  • 質問は随時受け付けます occurs in a context allowing questions during the explanation. This notice alone does not establish round-the-clock service hours.
• How it differs from 定期的
  • 定期的(ていきてき) focuses on regular intervals. 状況に応じて随時更新される means updating when circumstances require, not a promise of continuous updates at every instant.