Getting Nifi to wait, then try again

[#1]

In Nifi I have a processor that needs to place some parquet files into an HDFS directory. The idea is that if it fails, it should wait one second, then try again. If that fails, it will wait another second then try again. Finally if there is one more failure, it will email an admin. I configured it exactly as suggested in this article:

https://kisstechdocs.wordpress.com/2015/01/15/creating-a-limited-failure-loop-in-nifi/

However, this will only retry the process - it won't wait before doing the next step. Is there a way to configure this so that steps 2 and 3 will wait one second before proceeding?

[#2]

Just an additional note that I tried an expression like ${now():plus(1000)} but it's expecting a boolean expression. Is there perhaps some way to put this into a boolean format?