Note you can also edit the crash dive depth for each sub.
I have 'crash' set for 50m - deep enough to avoid aircraft weapons, shallow enough not to take too long before levelling out.
I recall Peter Cremer (U-333: the Story of a U-Boat Ace) pointing out that the required standard in training (as conducted in the Baltic) was to go from surfaced to 20m in 25 seconds (pretty sure that's right but I can check), so I think the dive time for the type VII is possibly a little long if anything.
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