LO data extraction

Hello,

I am working with LO dATA EXTRACTION. The question is : should I schedule the data load on R3 side (tran lbwe)? If yes , please tell me the logic. Assume the following example :

I schedule data load on r3 side once per week and once per day on BW side. In this case the system will not bring new data during the whole week?

Another thing - for already schedulled jobs I dont see the time. Where it disappeared?