There is the quote from Koenigsegg, supercars guy, https://www.koenigsegg.com/ it goes like this:

When you estimate the time for doing some project, multiply it by pi and generously round it on the higher integer.

Most of the time, it's true. Don't worry about the lab delays, even while your experiment is idling, your brain is working, and many times you will get some new, improved idea while waiting for the chemicals, spare parts...