Not to compromise on religious duties due to work:

Being that one is required to work in order to make for himself a living, and support himself and his family, stated above, it is very easy for the evil inclination to challenge a person to overdue his efforts on expense of Torah learning and praying with a Minyan.[1] Although in a time of necessity, one may work on expense of Davening with a Minyan, this only applies in a case of true necessity, and even then one who has strong enough trust in G-d should trust in Him to find him a job that will not require him to compromise on praying with a Minyan.[2] To quote from Hayom Yom[3], “No matter how much effort is exerted, no-one can earn one cent more than G-d has ordained that he – this particular person – shall earn. One must do what is necessary, but one must remember that all his work is but a vessel. The main thing is G-d’s blessing, and that blessing is earned by being observant of G-d’s commands: Davening with a minyan, observing Shabbat b’hidur (beyond the minimum, with “beauty”), meticulous observance of kashrut, having Kosher Milamdim for ones children.”

Summary:

One is required to place his absolute trust in G-d, that G-d will provide him with a Parnasa to support himself and his household. Together with this trust, one is required to also place effort to make a living and hence is to work for at least part of the day, depending on how much money he wants to make, and on his level of Bitachon. Nonetheless, at the very least one’s efforts may not override the following, and he must have at least a minimum of Bitachon that not compromising on the below will not affect his sustenance:[4]

1. Davening with a Minyan [unless time of great need, depending on level of Bitachon]
2. Kevius Itim Latorah by both day and night, preferably immediately after Shacharis.
3. Not transgressing any matter of business law [i.e. Ribis, stealing, cheating, lying, dishonesty, Hasagas Gevul, etc].
4. Giving Tzedaka

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[1] See Chofetz Chaim Pesichas Asei 12

[2] See Igros Kodesh 3:372

[3] Hayom Yom 16^th Adar Sheiyni

[4] See Bitachon Vihistadlus Perek 9