https://www.arista.com/en/products/7280e-series
Arista 7280E: Ultra deep 9GB of packet buffers
Total System Buffer
10Gbps: 9x8Gb/10Gb = 7.2 sec
40Bgps: 9x8Gb/40Gb = 1.8 sec
100Bgps: 9x8Gb/10Gb = 0.72 sec or 720msec
QFX10k: up to 100ms per ports ( any ports)