This article is a stub. It needs to be expanded to include more halacha's and broader sources.
According to Sephardim, a Yireh Shamayim should be strict to refrain from Melacha until 72 minutes after sunset like Rabbenu Tam.[1]
According to Sephardim, it is permitted for someone who keeps Rabbenu Tam time to ask someone who doesn't keep Rabbenu Tam time to do Melacha for him.[2]