IRS audit - NRP variety

Got an IRS notice couple weeks ago that I’d been randomly selected for an NRP audit on 2021 return. Talked to the agent and he explained they aren’t alleging any specific concerns with the return, that this is a different type of audit where they want to go over the full return and ask questions. Said the interview should last 60-90 minutes and could be followed up with a “field visit”. They won’t provide the questions they intend to ask in advance as they want the answers to be spontaneous. My CPA can/will participate in the interview.

Apparently these are fairly rare, anyone have any experience?