2 hours should be enough; if you are late and do miss the SFO-DFW flight, there are still options to MSN via ORD which would still get you in that evening
Crediting to QF, you would earn 120SCs for SFO-DFW , zero SCs for DFW-MSN, 10SCs for MSN-ORD and 20 SCs from ORD-SLC
Dave


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