In Hanafi school we are allowed to shorten the prayers (kasar) only during long journeys. Regards combining prayers, there are ahadeeth allowing combining prayers but only as an EXCEPTION, not as a general rule like shias. The learned brothers/sisters here will elaborate further inshallah. I'm open to correction on this. Work is NEVER an excuse, in fact it's a rather pathetic excuse. You are telling me you are sooooo busy that you can't spare 5 mins for fardh salah???? People will take toilet breaks and even prolong them at work, lasting 15 mins but can't spare 5 mins out of their "jam packed schedule" for the King of Kings?? Subhanallah look at our state..