Nah the poster above you is right for all cases. Reg NMS only protects the top of book quote regardless of the time in force specification. Source is page 140

Nah the poster above you is right for all cases. Reg NMS only protects the top of book quote regardless of the time in force specification. Source is page 140 of the following SEC publication on Reg NMS: http://www.sec.gov/rules/final/34-51808fr.pdf http://www.sec.gov/rules/final/34-51808fr.pdf "Over our dissent, the majority voted to adopt Regulation NMS on April 6, 2005, approving a trade-through rule protecting quotations at the ‘‘top of book.’’"