Ah confession time...
I once had to port an environment from Unix AIX to a VAX OpenVMS machine. Belief it or not, it was about 15 years ago:) Creating databases, dumping and loading data, modifying scripts and compiling tons of SW. At the end of a long day it all worked. "Let's just clean up this temporary directory and go home, I told my mate." Oops! I know the feeling, "hmm this takes longer than it should..." Next day it took about two hours to do everything again... I did learn from it, as it never happened again (so far).
Later a senior engineer explained me about the 4-factor. When you do overtime and get tired, everything takes 2 times as long and you make 2 times more mistakes. 2*2=4. It sounds silly but the 4-factor is a useful concept to know. Especially if you're managing a project and ask the SW engineers to do overtime to meet some deadline.
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