The authors report coherence times of 120us and 61us for the two (slightly different) Qubits. Experimental evidence for Qubit Q2 is provided in the Supplementary Material and for Qubit Q1 in reference 4.

Also, citing:

*" the error can be less than 1%, corresponding to a fidelity above 99% for the two-qubit CZ gate. The fast two-qubit operation frequency implies also that over 100,000 CZ gates can be performed within the single-qubit coherence time. [4]"*

and further

*"The tremendeous progress of quantum error correction codes over the last decade has resulted in schemes that allow fault-tolerant quantum computing with single and two-qubit errors as high as 1% [10]; values that already seem consistent with the fidelities of these silicon quantum dot qubits. These qubit fidelities could be further improved by lowering the sensitivity to electrical noise. This could be achieved by designing the two-qubit system such that it is completely decoupled from the reservoir during qubit control, possibly by additional pulsing on the barrier gates."*