diff --git a/crates/bin/pd/src/testnet/generate.rs b/crates/bin/pd/src/testnet/generate.rs
index 217fd6df9b..040d3cd247 100644
--- a/crates/bin/pd/src/testnet/generate.rs
+++ b/crates/bin/pd/src/testnet/generate.rs
@@ -287,17 +287,22 @@ impl TestnetConfig {
             consensus_params: tendermint::consensus::Params {
                 abci: AbciParams::default(),
                 block: tendermint::block::Size {
+                    // 1MB
                     max_bytes: 1048576,
+                    // Set to infinity since a chain running Penumbra won't use
+                    // cometbft's notion of gas.
                     max_gas: -1,
-                    // minimum time increment between consecutive blocks
+                    // Minimum time increment between consecutive blocks.
                     time_iota_ms: 500,
                 },
-                // TODO Should these correspond with values used within `pd` for penumbra epochs?
                 evidence: tendermint::evidence::Params {
-                    max_age_num_blocks: 100000,
-                    // 1 day
-                    max_age_duration: tendermint::evidence::Duration(Duration::new(86400, 0)),
-                    max_bytes: 1048576,
+                    // We should keep this in approximate sync with the recommended default for
+                    // `StakeParameters::unbonding_delay`, this is roughly a week.
+                    max_age_num_blocks: 130000,
+                    // Similarly, we set the max age duration for evidence to be a little over a week.
+                    max_age_duration: tendermint::evidence::Duration(Duration::from_secs(650000)),
+                    // 30KB
+                    max_bytes: 30000,
                 },
                 validator: tendermint::consensus::params::ValidatorParams {
                     pub_key_types: vec![Algorithm::Ed25519],
diff --git a/crates/core/component/sct/src/params.rs b/crates/core/component/sct/src/params.rs
index 07419015e9..e5acf500eb 100644
--- a/crates/core/component/sct/src/params.rs
+++ b/crates/core/component/sct/src/params.rs
@@ -34,11 +34,12 @@ impl From<SctParameters> for pb::SctParameters {
     }
 }
 
-// TODO(erwan): defaults are implemented here as well as in the `pd::main`
 impl Default for SctParameters {
     fn default() -> Self {
         Self {
-            epoch_duration: 719,
+            // Measured in blocks, assuming a 5s block time
+            // this is about a day worth of blocks.
+            epoch_duration: 17280,
         }
     }
 }
diff --git a/crates/core/component/stake/src/params.rs b/crates/core/component/stake/src/params.rs
index 4a8b424edf..b262b4faaf 100644
--- a/crates/core/component/stake/src/params.rs
+++ b/crates/core/component/stake/src/params.rs
@@ -65,11 +65,11 @@ impl From<StakeParameters> for pb::StakeParameters {
     }
 }
 
-// TODO: defaults are implemented here as well as in pd
 impl Default for StakeParameters {
     fn default() -> Self {
         Self {
-            unbonding_delay: 719 * 3 + 1,
+            // About a week worth of blocks.
+            unbonding_delay: 120960,
             active_validator_limit: 80,
             // Copied from cosmos hub
             signed_blocks_window_len: 10000,