The IRS has a target of 21 days from the date the tax return was accepted by the IRS until the tax refund is approved and sent by the IRS. This has nothing to do with TurboTax or any other tax preparation software or paid tax preparer. The IRS target is only an estimate and is not a guarantee, it could be sent sooner or later than the target.
See this IRS website for federal tax refund FAQ's - https://www.irs.gov/refunds/tax-season-refund-frequently-asked-questions
