Hello, I need a copy of my 2018 1040 EZ filed with you last year; why does it take up to 45 days? Please advise how soon I may receive this PDF file? Thank you!

There were no Form 1040EZ or Form 1040A for tax year 2018.  Just a Form 1040.  Just like this year, 2019.

It does not take 45 days.  What you are looking at is if you want the personal data that TurboTax has on you sent to you.  That does not mean your prior year online tax returns.

To access your current or prior year tax returns sign onto the TurboTax website with the userID you used to create the account - https://myturbotax.intuit.com/

Scroll down to the bottom of the screen and on the section Your tax returns & documents click on Show.  Click on the Year and Click on Download/print return (PDF)

Follow the Steps in this TurboTax support FAQ EXACTLY as shown

See this TurboTax support FAQ for accessing prior year online tax returns - https://ttlc.intuit.com/community/prior-year-return/help/how-do-i-access-my-prior-year-return/01/270...

If you used the desktop CD/Download editions installed on your computer, the only copy of your tax data file and any PDF's will be on the computer where the return was created.  TurboTax does not store online any returns completed using the desktop editions.

Or go to this IRS website for free federal tax return transcripts - https://www.irs.gov/individuals/get-transcript

For a fee of $50 you can get a complete federal tax return from the IRS by completing Form 4506 - http://www.irs.gov/pub/irs-pdf/f4506.pdf