HN39
To put some numbers your question, the high speed protection will apply a nose-up order up to 1.75 g (FCOM). At FL350, M=0.8, ISA+13 the AoA at 1g is about 2,9 degrees and buffet onset loadfactor is about 1.65 at AoA=5,6 degrees (assuming linearised QF72 AoA), which could be attained in about 1 sec. 1.75 g would take the airplane to FL384, M=0.66 (1g buffet onset at that FL) in about 12 sec
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Thanks for that HN39. I assume at that point, there would be a residual nose up pitch angle of about 20 degrees or so. It would seem likely that the pitch angle protection would set an upper limit in any case.