This filling makes enough for 1 to 1.5 loaves of bread sliced lengthwise (pre-order from your bakery or grocery store having it sliced lengthwise instead of the usual sliced bread). The average loaf has 9 useable slices and will make 36-48 round rolled sandwiches. This will serve 8-10 people for tea, assuming there are other treats on offer. When I'm making tea sandwiches, I make the fillings the day before and refrigerate them overnight. I always assemble the sandwiches as close to the time they're needed as possible. They are a bit fiddly but they don't actually take that long to make. For the teacher's tea I used 3 loaves and 3 types of filling. It took me less than 2 hours to assemble the sandwiches. There were about 100 sandwiches in the end, more than enough for 20 people.