Once in a blue moon I'll go out to eat since I don't work from coffee shops or the library.
It takes around 15 mins to get the water boiling and 10 mins until the pasta is done, and I usually try to make some sort of a sauce in that time frame :-)
Anything that doesn't take too long.
I have a world-famous bbq joint less than one block away, and somehow I never find myself down there. I should, though!
It is a little time-consuming, but not too bad - maybe 15-20 min of downtime. My girlfriend and I both work from home and eat Paleo, so ready options are a bit thin on the ground.
I have a bulletproof coffee(coffee + butter + mct oil) in the morning, which keeps me full until dinner.
Then I have a large dinner and I'm set.
I just use coffee with butter + mct oil. I eat a keto diet so it fits my macros perfectly, and it keeps me going all day.