The timeline to complete a 1031 exchange is very strict, encompassing a 45-/180-day period. This means there is a deadline to satisfy by day 45 and another to satisfy by day 180.
The 1031 exchange timeline begins the day the relinquished property is sold:
You should seek and obtain the services of a Qualified Intermediary prior to the sale of your relinquished property. The time needed to secure your Qualified Intermediary does not count towards the 45-/180-day 1031 exchange timeline.
Closing on the replacement property must take place by day 180 or, if earlier, by the due date for filing the tax return for the year in which the relinquished property was sold.
*There are a number of permissible ways to identify replacement property and the best way to identify will vary depending on your situation.