The Ohio Department of Taxation has processed about three and a quarter million state income tax returns and expects to receive another two and a half million by the April 15th deadline. Tax Commissioner Bill Wilkins says taxpayers who mail in paper returns will have to wait six to eight weeks for a refund. But taxpayers who use the department's Internet filing system -- called Ohio I-File -- can get refunds in five to seven days, . Wilkins says it takes an average of ten minutes for taxpayers to use Ohio I-File, and it costs the state about a third as much to process the returns. About 40 percent of last year's returns were filed electronically.