Good question. Many modern day reptiles can go a long time without food. But a t rex is many orders of magnitude bigger than anything we have now. I did do a zoology major at uni, but my physiology knowledge sucks (unsurprising given I barely passed it).
What the fuck would you poms know about it? Like in the cricket, Australia has you beat. You’ve had 6 since 2000, we’ve had 8.