In the Durations and Rates tab you will see 2 Sections;
Durations, includescreate-button and a list of the durations on the Time Charter Contract.
Duration and Rates, includes a list of the Rates along with the connected Duration on the Time Charter Contract.
Duration and Rates tab on TC Drawer
In the Durations Section you create new durations by clicking the -icon in the top right of the Section and click on any of the durations to edit or delete them.