Verified answer

It's 86 miles. The tough part will be I-5 north from the Orange Crush, and the part from the LA County Line into downtown. You'll get some traffic around the crush, and probably still have some residual traffic from morning rush. If you have no traffic, that's about 90 minutes. I would add 15-30 minutes to allow for traffic.

at least an hour...maybe 1.5 hours if there is traffic

Well my friend went there and it took him 32 hours of driving from Wyoming.