Should it take 3 days to be accepted?

It should not take that long. What does Where's My Refund say on the IRS site?

 

Once your return is filed, TurboTax has no control over the processing of your return or the release of your refund.

 

Here are a couple FAQs to track your refund:
When will I get my federal tax refund?
How do I track my state refund?
Why does Where's My Refund say "approved" but TurboTax still says "accepted"?

 

Why do some refunds take longer than others?

What if my IRS refund is taking longer than 21 days?

TurboTax hasn’t accepted it yet. It still says pending and it’s been 3 days.

It is not unusual for your return to stay in pending status for several days sometimes longer depending on the back log of returns filed and time it takes for the IRS to process them. Keep checking the IRS Where’s My Refund? site for updates. The tool is updated daily (usually in the overnight hours) so you don’t need to check more often. Please see the TurboTax FAQ What does "Pending" mean? for additional information.