Rene said here that a c-lightning node is safe for around 24 hours to be offline (depending on the locktime). This is set with watchtime-blocks
in the configuration file of c-ligthning. But this will only be used for new channels, as far as I understand.
Is it possible to change the their_to_self_delay
value of a already existing channel?
The their_to_self_delay
value is equal to watchtime-blocks
value set in the general c-lightning config file.