So if I expect to make significant gains on a property, I'll usually put a renter in there for 6 months to a year, so it closes after the 1 year deadline.

I'll check with him next week, after the tax deadline passes.

Penalties for missing deadlines.

The repayment terms for a 401k participant loan are equal monthly/quarterly payments of principal and interest (typically prime plus 1%) over a 5 year term (longer if used to acquire your principal residence).Please note that if you take a full $50,000 and then pay back the loan, you can't take another $50,000 until 12 months after the first loan was fully paid back.Per the loan offset rules that went into effect with the 2018 Tax and Job Act: if you leave your job and the loan is current at the time you leave your job but then the loan goes into default because you left your job, you will have until your tax return deadline (including any timely filed extension) to make the loan current by depositing the outstanding balance into an IRA (and thereby avoid the taxes and penalties that would otherwise apply).4) The loan must be paid back in equal payments so making pre-payments won't lower the monthly payment but will shorten the term. 

Doors and windows, insulation ......etc....Looking back now, It felt like my head was going to explode by having to learn all different trades all at once while almost all the deadlines were broke. ( My wife called my the "two weeks contractor" because i told her so often for months, that we will be done In two weeks. :) I learned a lot and it comes very handy now when I hire contractors for our rentals,  BUT I am not sure if I would do it again knowing what I know now.

Similar deadlines apply, though.

Deadline is ON or BEFORE July 8th.....

One last question, what if you set up a 1031 and close and then at day 45 after closing-the deadline for finding your new real estate -you were unable to find suitable properties.

Good for you on having a clear goal + deadline! 

Once again, if a lender needs more time, the landlord must extend the deadline in accordance with the lender’s estimate of how long it needs.