Is a single expiation required for all the aforementioned oaths, or an expiation for each oath individually?

Sincere repentance from sins and breaking oaths is obligatory, for whoever does not repent is a transgressor. If you swear a single oath concerning multiple matters, a single expiation is required of you. However, if you repeat the oaths and make each sin subject to an independent oath, then an expiation is due for each oath, according to the more preponderant view. Repeating the oaths on the second day falls under the initial oaths, and a single expiation is required for it.