When/if I should get back with owner after offer & no response?

I made my first offer on a MHP 3 weeks ago. No decision was made that night. When do I follow up with a phone call?
Thanks, Lynn

Lynn,The seller probably didn’t take your offer seriously for some reason.  I would suggest you fill out a purchase agreement, sign it, and present the offer again.  Submitting a signed offer shows that you mean business (versus just a letter of intent, etc).  I typically allow 48 hours for the seller to respond.