Don't cold call them. Set the calls up in the email and ask for 15-20 minutes. I would say twice a week. Probably 4-5 emails before you just say "It's clear my

Don't cold call them. Set the calls up in the email and ask for 15-20 minutes. I would say twice a week. Probably 4-5 emails before you just say "It's clear my hypothesis is wrong. If things change I'll get back in touch".