How Long Should You Send Cold Emails?

I'm definitely not an expert in cold outreach, but I think what helped for us is that I was the co-founder writing the message. We would do sequences of cold emails like we would send seven or eight of them. And then we were like, people don't have time, right? So we had one super short message, which would basically say, hey, how are you doing? We're building this and we would love to hear your thoughts on it. But again, I don't think that's like there's no like one roof fits all for these things. With hotspot, it was completely different.