Closing a channel
Closing a channel is really simple. Go to the 'Channels' tab, right-click on the channel you want to close and select 'Close channel'. You should use 'Force-close channel' only if the other party is offline. In such a case, you will get your funds back after one week. In both cases, you won't be able to specify the closing transaction fee. Other implementations have such a feature.
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BitCryptex I think it will only need an average of 1 day to retrieve the funds in case of force-closure.
I've tried to force close mine and according to this:

It will only require 144blocks = 1day (
for 10min/block) to broadcast the saved "
our_ctx_to_local" transaction.
And it did automatically broadcast after a day+.