How to change node CSR certificates duration ?

Issue

• The following bootstrapped node certificates duration is 1 year (8760h) by default, but you want to change the duration to expand.

# ls -1 /etc/origin/node/certificates/
kubelet-client-2019-05-12-21-17-37.pem
kubelet-client-current.pem
kubelet-server-2019-05-12-21-37-55.pem
kubelet-server-current.pem