I don't know in general, but JPL published a video [0] yesterday of three interviews. One of the systems engineers for the MOXIE (atmospheric oxygen separation) unit will wait several weeks after landing before their first experiment. Actually, scientific american has published a timeline that seems to corroborate that [1].

[0] https://youtu.be/TUd604rBR6I?t=643

[1] https://www.scientificamerican.com/article/the-first-100-day...