Changes to PayPal Dispute Filing Window

PayPal is changing the time allowed to file a Merchandise Dispute from 45 to 180 days. How does this stack up against other processors? Does it affect your business?

Most of my revenue is from companies paying on Open Account, but I still do a small amount of PayPal sales. Knowing that someone may come back after 6 months and decide to bypass talking to me and file with PayPal directly is annoying to say the least.