CREATE TABLE table_29218221_3 (fri_3_june VARCHAR(255), thurs_2_june VARCHAR(255))
What was the Friday June 3 practice time of the rider who did 20' 50.45 108.623mph on Thursday, June 2?
    
SQL: SELECT fri_3_june FROM table_29218221_3 WHERE thurs_2_june = "20' 50.45 108.623mph"