Combined work and trading?
Maybe you mean to make trading a side job like that?
Not a few traders who actually they already have activities in the form of work as a source of income to support the family. But to increase income not a few who then fill their free time by doing side jobs, one of them being a trader.
There is no prohibition on that, and it's fine as long as you can divide your time and not interfere with family finances. Do not let your savings use for trading while trading skills are not so good. Better to improve skills first and then trade with real capital.
Matter of time, no need to worry because this trade is very flexible. You can trade anytime and anywhere without being subject to time,