I would want to add time for a bit of stress testing, backups, etc. If I'm building something that needs to "stand the test of time", I find a day lets me rela

I would want to add time for a bit of stress testing, backups, etc. If I'm building something that needs to "stand the test of time", I find a day lets me relax, meander, think it through, and not get stressed over not moving fast enough. I've also learned from experience to always over estimate these things ;)