The real USMLE Step 1 is 7 hours long (280 questions broken into 7 blocks of 40). Most students hit a "cognitive wall" around block 4.
Here is why you need the full 100%:
A "full" subscription means you have enough time to complete a (all questions), a second pass of incorrects , and a random, timed simulated run . uworld usmle step 1 full
: Better for "Dedicated" study periods to simulate the unpredictability of the actual exam. Common Pitfalls to Avoid The real USMLE Step 1 is 7 hours