The stockholder who calls at 4h30 pm ? Hah, I have worked in industry projects for 25 years management for 25 years and I know why he calls at 4h30 pm.
It’s because he’ been busy with other things and postponed the question he wants an answer for till the last minute instead of calling first before he gets his work done. Or ( more likely) it’s been sitting on the desk since yesterday and he has just remembered he needs an answer by tomorrow.
More importantly, he KNOWS he has called you before at 4h30 and you worked late to get the answer out the same day, so he KNOWS he can leave it late.

Tell him( or her) politely you need to get in touch with (whoever) to get him the correct information and if possible it’ll be today or first thing in the morning.
AND THEN you do it the next day. After a few times you’ll get the message across and the urgent questions will come in the morning. And only the really unforeseen ones that are truly urgent will remain.
After 7 pm ? There are no urgent works after 7pm. Schedule them for the next day ( unless it has 6 hours of meetings in it) or the day after.
If you send it out today, NO ONE WILL READ IT till the next day or whenever they come out of the morning meeting.
Keep pampering your customers and they’ll never learn.
Because otherwise you’ll keep on working overtime to make for THEIR lack of planning.
Draw the line. Make your schedule and to do list for the next day before you leave for home. Leave a few hours unfilled for jobs that take more time or really urgent business.
Work comes first ,yes, but only in the workplace ! You work to live, you don’t live to work. Otherwise you’re on a straight road to a burnout.

And about your schedule : 2 meetings of 4 and 2 hours AND you’re trying to get a day’s work done ? No way. IF that happens every day, you’ll never make it. I could write a book about unproductive long meetings, but other people have already done that

Have a great weekend and take a well deserved break!

I schedule changes from time to time, depends on the work load was handed down – sometimes I could sleep a full 8 hours a day while sometimes I just survive on one-hour naps interspersed throughout the day :/ I guess things will only go downhill after I graduate *laughs*

Anyway, have a great weekend! Don’t tell us you’re burning this weekend as well!

Hmm, well, I guess for me, if it’s a bug, that’s urgent, then that’s at the top of my list. Then I keep going down that list. The list is according to when the deadline is, and how long it (may) take for me to program it. If it’s something that I think would be the hardest thing to do, I’d try to get that over with first. Or vice-versa, if it’s something easy, and it’d take me a couple of hours, I’d just do it then, and then work on the harder stuff. I guess it kind of depends on my mood too.