The amount of time and filament needed for each part that you see to the right of each file in the ‘Source Files’ tab on the model’s page is the approximate amount that could be required (https://monosnap.com/file/CSNd8NMNPYy0pegwSJ5F54TAKctznQ). These estimates are based on default standard settings that are generated by CuraEngine with some non-default settings that we have used. The time depends also on the layer height, the infill %, the support structures, the speed and so on. More details about Filament Length and Printing Time Estimates please read here: https://www.gambody.com/blog/filament-length-printing-time-estimates-gambody/.
As for the printing recommendations that can be found on the model's page, tab 'Printing details', then these are those settings that Gambody tests certain models with and upon receiving successful results we recommend them to customers. Since they are custom settings that are aimed at receiving the best printing result possible they differ from the default standard settings that CuraEngine provides. But, as we always say, these printing details are just recommendations, not an obligation. Moreover, those printing settings generated by CuraEngine always differ from the ones of Cura software since the latter is being continuously improved and updated that gives the user an opportunity to dial always more accurate adjustments into the new fields that appear in the slicing software.