Not everyone checks various contacts every couple hours.
I do.....but I run a business as well as volunteer for a few automotive websites. Sorta the butthead that keeps peeps in line as a volunteer.....thus my time....no real pay....

I have no clue on your question.....I will say some peeps pop on every few days since the Internet/email is not their top priority in life.....
Your choice on what to do.....I have no clue on seller....