This is an uncharitable take. Who said anything about an interruption every 20 minutes? We're talking about an artist doing an exhibition at a gallery, by any measure, this is a pretty significant collaboration that is in the artist's best interest and not something their getting spammed with dozens of a times a day.
If you read and digest the article, the point is not to create a litmus test based on time-to-response, it's to recognize there are a lot of people to talk a big game but are unserious about achieving shared goals.
If an artist is not responsive because they are so serious about their creative process that they don't have time to respond to a gallery doing an exhibition than maybe that's the right thing for what they are serious about, but it does jack shit for the gallery staffer who is serious about creating an exhibition.
If you read and digest the article, the point is not to create a litmus test based on time-to-response, it's to recognize there are a lot of people to talk a big game but are unserious about achieving shared goals.
If an artist is not responsive because they are so serious about their creative process that they don't have time to respond to a gallery doing an exhibition than maybe that's the right thing for what they are serious about, but it does jack shit for the gallery staffer who is serious about creating an exhibition.