Friday morning my boss came up to me while I was at my desk speaking to another person and asked me if I had finished writing some sections of the works approval. He then asked when it would be done. He was angry and asking me in a demanding threatening tone, so I was stunned and eventually said I was going to do it on the weekend.

He does this all the time and asks me when things will be done. How do I even work that out in the first place?

I go back to my notes on the section - I have captured some of what he wanted me to do but not all of it. I start working. If I had to guess up front, I never would have guessed it would take this long. 8 hours later and I've done half of it. The stuff I promised to do over the weekend is not completed. Scared about going to work, as it is supposed to be reviewed with him today.

How do I work out how long things will take and set reasonable and achievable deadlines. I can't just guess or he'll argue the number and say - no, it can be done faster than that, it has to be done by X.