sorry, but this is a workaround and not a solution. i don't think it is wise to increase cups connection timeouts, especially if you run cups server for a large institution with a lot of printers and a lot of clients...
from the description of the bug and discussion here it is clear this is a libre bug which can not be fixed by this workaround. you just made the time after which libre fails to print larger. this is not the right solution...
sorry, but this is a workaround and not a solution. i don't think it is wise to increase cups connection timeouts, especially if you run cups server for a large institution with a lot of printers and a lot of clients...
from the description of the bug and discussion here it is clear this is a libre bug which can not be fixed by this workaround. you just made the time after which libre fails to print larger. this is not the right solution...