Direct mailing question

[Luke Espasandin]

Hey everyone I hope y'all are having an awesome day so far! I just sent out 74 letters to possible leads and have all the info of the owners on a spreadsheet. I was wondering if I could get some advice for how often you have to resend those letters to the owners who don't answer and for how long? Thank you I would really appreciate it and if you're a real estate investor or wholesaler in the Vancouver, WA area then I'd love to meet you and get connected with you!