Unfortunately, importing of time entities has not been implemented yet in Targetprocess. It is however in the development backlog and is planned to be implemented at a later date. In the interim I'd recommend looking into importing your time records as an Extendable Entity, which can be pulled in in the CSV format. Please find below a link to the support page on how to Import Extendable Entities: Import Extendable entities | Targetprocess - Enterprise Agility Solution