That time frame should be at least 21 days, with most cards offering a 25 - day grace period. (debt.org)
The truth is credit card insurers are generally only willing to take over your monthly minimum payment, which for most card issuers, is normally in the $ 20 to $ 30 range. (policygenius.com)
Most card issuers offer an interest free period on purchases if the user meets certain criteria, but the specifics vary by card. (valuepenguin.com)