added unbonding period length context

docs/learn/learn-staking.md

@@ -480,8 +480,9 @@ Once a validator gets slashed, it goes into the state as an "unapplied slash". Y
 via
 [Polkadot-JS UI](https://polkadot.js.org/apps/?rpc=wss%3A%2F%2Frpc.polkadot.io#/staking/slashes).
 The UI shows it per validator and then all the affected nominators along with the amounts. While
-unapplied, a governance proposal can be made to reverse it during this period (7 days on Kusama, 28
-days on Polkadot). After the grace period, the slashes are applied.
+unapplied, a governance proposal can be made to reverse it during this period
+({{ polkadot: <RPC network="polkadot" path="query.staking.bondingDuration" defaultValue={28}/> :polkadot }}{{ kusama: <RPC network="kusama" path="query.staking.bondingDuration" defaultValue={7}/> :kusama }}
+days). After the grace period, the slashes are applied.
 
 The following levels of offense are
 [defined](https://research.web3.foundation/Polkadot/security/slashing/amounts). However, these
@@ -539,8 +540,8 @@ can now unbond them immediately.
 :::
 
 If your bonded balance did not back any validators in the last
-{{ polkadot: 28 days on Polkadot :polkadot }}{{ kusama: 7 days on Kusama :kusama }}, you are
-eligible to perform fast unstaking. The
+{{ polkadot: <RPC network="polkadot" path="query.staking.bondingDuration" defaultValue={28}/> :polkadot }}{{ kusama: <RPC network="kusama" path="query.staking.bondingDuration" defaultValue={7}/> :kusama }}
+days, you are eligible to perform fast unstaking. The
 [staking dashboard](https://staking.polkadot.network/#/overview) will automatically check if you
 qualify. For more information, visit the
 ["Fast Unstake" section in this support article](https://support.polkadot.network/support/solutions/articles/65000169433-can-i-transfer-dot-without-unbonding-and-waiting-28-days-).
@@ -574,15 +575,37 @@ users to withdraw. For in-depth understanding, check the
 
 ### Cons of Staking
 
-- Tokens will be locked for about {{ polkadot: 28 :polkadot }}{{ kusama: 7 :kusama }} days on
-  {{ polkadot: Polkadot. :polkadot }}{{ kusama: Kusama. :kusama }} No rewards will be earned during
-  the unbonding period.
-
+- Tokens will be locked for about
+  {{ polkadot: <RPC network="polkadot" path="query.staking.bondingDuration" defaultValue={28}/> :polkadot }}{{ kusama: <RPC network="kusama" path="query.staking.bondingDuration" defaultValue={7}/> :kusama }}
+  days on {{ polkadot: Polkadot. :polkadot }}{{ kusama: Kusama. :kusama }} No rewards will be earned
+  during the unbonding period.
 - Possible punishment in case of the active validator found to be misbehaving (see
   [slashing](#slashing)).
 - Lack of liquidity i.e. You would not be able to use the tokens for participating in crowdloans or
   transfer them to different account etc.
 
+#### Unbonding Period Length
+
+The
+{{ polkadot: <RPC network="polkadot" path="query.staking.bondingDuration" defaultValue={28}/> :polkadot }}{{ kusama: <RPC network="kusama" path="query.staking.bondingDuration" defaultValue={7}/> :kusama }}-day
+unbonding period serves a crucial role in mitigating ex post facto slashing, particularly in the
+context of guarding against long-range attacks. When a client encounters a chain finalized by
+[GRANDPA](./learn-consensus.md#finality-gadget-grandpa) that originates more than
+{{ polkadot: <RPC network="polkadot" path="query.staking.bondingDuration" defaultValue={28}/> :polkadot }}{{ kusama: <RPC network="kusama" path="query.staking.bondingDuration" defaultValue={7}/> :kusama }}
+days in the past, it lacks the security of slashing protection.
+
+Essentially, this period establishes a cadence for synchronizing with the chain or acquiring a
+checkpoint within a timeframe that engenders trust. It's worth noting that while the choice of a
+{{ polkadot: <RPC network="polkadot" path="query.staking.bondingDuration" defaultValue={28}/> :polkadot }}{{ kusama: <RPC network="kusama" path="query.staking.bondingDuration" defaultValue={7}/> :kusama }}-day
+period is somewhat arbitrary, it unquestionably provides a higher level of security compared to a
+shorter period.
+
+Looking ahead, there may be a Request for Proposals (RFP) for implementing a mechanism for fast
+unbonding through an unbonding queue. Importantly, this proposed change will not alter the
+{{ polkadot: <RPC network="polkadot" path="query.staking.bondingDuration" defaultValue={28}/> :polkadot }}{{ kusama: <RPC network="kusama" path="query.staking.bondingDuration" defaultValue={7}/> :kusama }}-day
+period's role in maintaining security; instead, it will ensure that an excessive number of stakers
+cannot unbond too swiftly.
+
 ## How many Validators?
 
 {{ polkadot: Polkadot :polkadot }}{{ kusama: Kusama :kusama }} currently has