How do I get my tax returns ?

Are you wanting copies of tax returns you filed?   Did you efile, and were they accepted?
Or are you asking about tax refunds?

How long does it usually take after getting accepted for the return to be deposited

See the info I left below.  If the IRS tool shows your return is "being processed" longer than 21 days, we can tell you how to contact the IRS to see if they can give you any info on the delay.

No one can know exactly when your funds will be deposited.  There are too many variables including differences in bank processing times once the IRS sends the funds.

The IRS says 9 out of 10 filers who efile and choose direct deposit will get their refunds within 21 days.  You can monitor it with the IRS tool mentioned below.  Some returns take longer for additional processing due to specific items in the return.  Some are pulled at random for more thorough investigation.

NOTE:  If you chose to pay any TurboTax fees out of your Federal refund, that is another link in the chain, since your funds go first from the IRS to an intermediary bank where the fees are subtracted.  Then that intermediary bank sends the rest of the funds to your bank in a second direct deposit.

You can doublecheck with this tool to be sure the return was successfully efiled and accepted:
https://shop.turbotax.intuit.com/efile/efile_status_lookup.jsp

You can monitor the status of your Federal refund at this IRS page below.  If you recently efiled, wait 24 hours after acceptance before trying this tool, or it may not find it.
http://www.irs.gov/Refunds

To track a state refund:
https://ttlc.intuit.com/questions/1899433-how-do-i-track-my-state-refund