Probably worse than general surgery.
Most trauma fellowships are combined with critical care. This is for 2 reasons. 1) Most trauma is non-operative, or not operated on by trauma surgeons anyway. Thus, your practice will be managing post traumatic injuries and pathophysiological recovery in the trauma intensive care unit. 2) Since you don't have a referral clinic, unless you do acute care/general surgery as well, you have more time so you are the surgical intensivist. Basically, you get every subspecialty service's sickest patients dumped in the unit and you're in charge until they die or are healthy enough to go to the floor.
As mentioned, it can be "shift" work or splintered in to call. Most jobs are academic where you have the residents/fellows to do you operating and scut work. Nonetheless, you have to physically be in the hospital a lot and babysit residents.