Praise be to Allah.
The Muslim must pay attention to that which Allaah has enjoined upon him. Prayer in congregation is obligatory, but if it is not possible to pray in one jamaa’ah because of the demands of work, it is fine if you pray in a number of groups within the time specified for each prayer. You should strive to pray behind the regular imaam, and pray the prayers at the time specified by sharee’ah. If that is not possible, then the Muslim must fear Allaah as much as he can, after which Allaah does not burden any soul beyond what it can bear.