After efiling, how soon you get the acknowledgement e-mail that your tax return was received by the IRS

Lets say I efiled tax return today using a UTAX software - I did not receive any email staring that your return was transmitted.

Usually with turbotax - you get an email right away stating that your return was transmitted to IRS and than comes another email (not sure after how much time) that your return was accepted by IRS.

So after how many hours/days we get this email about IRS receipt?