持续 (chíxù) — use 历时 to emphasize the duration of an event rather than its ongoing nature.

Think of 历 (lì) as a 'calendar' and 时 (shí) as 'time'. Visualize flipping through a calendar while counting the days or hours—it helps you remember that 历时 is about measuring how long something endures.

Be careful not to confuse 历时 with similar terms like 经过 (jīng guò), which indicates passing through rather than lasting. It is often used in both formal and informal contexts, and common collocations include 历时多久 (lì shí duō jiǔ) meaning 'how long does it last?'.

While 历时 is not an HSK vocabulary word, it connects with related terms like 时间 (shí jiān, time) and 持续 (chí xù, to continue). Focus on the context of time when learning it and practice forming sentences that describe durations.

In Chinese culture, the concept of time is often viewed in relation to historical events and the cyclical nature of life, making 历时 particularly relevant in discussions about history or traditions that last across generations.

Learners often mix up 历时 with 进行 (jìn xíng, to be in progress) when discussing ongoing events. For example, saying '这个活动历时进行' is incorrect; the correct form would be '这个活动进行中' (This activity is ongoing).