It's important to consider a number of factors when talking about review times.
If the review team based in America, they might be short-staffed due to Easter holidays and staff taking a leave break since the Easter period is common for this.
As you may know, extensions are reviewed in the order they are submitted, so right now may be a period where many developers have published new extensions or updates.
- It would make sense, given the Easter break once again (where devs have taken the time to work on and update their projects)
Put these factors, and many that I haven't included, together and that may explain the current "delays".
Note, review times spanning days is still well within the listed review period.
I would also say that its unreasonable to base review time expectations on quick review times, especially given the last sentence.