Benfield Conduit Bending Manual
"In cases like this, the bender should be reversed and the bend made a w a y from the first bend [ flipping the conduit around 180 degrees, Ed ] as shown in Fig. 12. Instead of using the star-point symbol, use the arrow at the mouth of the bender and allow for the appropriate take-up as though making a simple 24" long stub-up bend."
In this particular example, the goal was back to back nineties snuck into a 24" space. First a stub was bent. Then, using its projected back-side dimension, a mark could be set, coming back the other way, measured as if a stub of 24" was desired.
For non-manual benders, this should be the standard routine.