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This is doable but takes a bit of time:

sage: %time u = CBF(0.5+40000000000000000000*I).zeta()
CPU times: user 30min 49s, sys: 113 ms, total: 30min 49s
Wall time: 30min 51s
sage: u
[1.572198667701050 +/- 7.12e-16] + [1.946758000953464 +/- 5.17e-16]*I