Criterion for length of hotel stay in nights.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v25/common/criteria.proto)

| Fields ||
|---|---|
| ## `max_nights` | `int64` High end of the number of nights in the stay. |
| ## `min_nights` | `int64` Low end of the number of nights in the stay. |