Here are some figures of time rendering :
GPU mode, Geforce RTX 3060
***** Single frame *****
Cycles :
Samples 1024, 1920x1080, light bounce 12, denoise on = 17s
Samples 1024, 1920x1080, light bounce 12, denoise off = 17s
Samples 1024, 1920x1080, light bounce 4, denoise off = 17s
Samples 1024, 1920x1080 25%, light bounce 4, denoise off = 2s
Samples 64, 1920x1080 25%, light bounce 4, denoise off = 1s
Workbench, 1920x1080 : 0.12s
***** Animation 300 frames *****
Workbench, 1920x1080 = 1mn05s
Workbench, 1920x1080 25% = 9s
Cycles, Samples 64, 1920x1080 25%, light bounce 4, denoise off = 2mn40s
Cycles, Samples 16, 1920x1080 25%, light bounce 4, denoise off = 1mn50s
Eevee, 1920x1080 25%, Samples 16 = 19s