You can easily set a timer on the order, I've mine set to 7 days but i'd say 3 days would be better as it puts "urgency" on the buyer...

On a side note....breaking news...1 in 6 people don't have a bank account!!

One in six people have no bank account, says report | BreakingNews.ie

Anyone know how many people out of 10 have a credit card?