For example,

import spaces

@spaces.GPU(duration=70)
def generate_image():
    pipe = DiffusionPipeline.from_pretrained("black-forest-labs/FLUX.1-schnell",  torch_dtype=torch.bfloat16).to(device="cuda")

As a trivia note, if there is not any method with @spaces decorator in the code in Zero GPU space, it will crash.
I heard that there is a good benefit to setting true in the environment variable ZEROGPU_V2. Specifics are unknown.