diff --git a/src/qt/optionsdialog.cpp b/src/qt/optionsdialog.cpp
index adf781c97d..bb4b0fc173 100644
--- a/src/qt/optionsdialog.cpp
+++ b/src/qt/optionsdialog.cpp
@@ -210,6 +210,11 @@ OptionsDialog::OptionsDialog(QWidget* parent, bool enableWallet)
     maxmempool->setMaximum(std::numeric_limits<int>::max());
     CreateOptionUI(verticalLayout_Mempool, maxmempool, tr("Keep the transaction memory pool below %s MB"));
 
+    mempoolexpiry = new QSpinBox(tabMempool);
+    mempoolexpiry->setMinimum(1);
+    mempoolexpiry->setMaximum(std::numeric_limits<int>::max());
+    CreateOptionUI(verticalLayout_Mempool, mempoolexpiry, tr("Do not keep transactions in memory more than %s hours"));
+
     QGroupBox * const groupBox_Spamfiltering = new QGroupBox(tabMempool);
     groupBox_Spamfiltering->setTitle(tr("Spam filtering"));
     QVBoxLayout * const verticalLayout_Spamfiltering = new QVBoxLayout(groupBox_Spamfiltering);
@@ -456,6 +461,7 @@ void OptionsDialog::setMapper()
 
     mapper->addMapping(maxorphantx, OptionsModel::maxorphantx);
     mapper->addMapping(maxmempool, OptionsModel::maxmempool);
+    mapper->addMapping(mempoolexpiry, OptionsModel::mempoolexpiry);
 
     /* Window */
 #ifndef Q_OS_MACOS
diff --git a/src/qt/optionsdialog.h b/src/qt/optionsdialog.h
index 13cad80357..dd3042a721 100644
--- a/src/qt/optionsdialog.h
+++ b/src/qt/optionsdialog.h
@@ -91,6 +91,7 @@ private:
     QValueComboBox *mempoolreplacement;
     QSpinBox *maxorphantx;
     QSpinBox *maxmempool;
+    QSpinBox *mempoolexpiry;
 };
 
 #endif // BITCOIN_QT_OPTIONSDIALOG_H
diff --git a/src/qt/optionsmodel.cpp b/src/qt/optionsmodel.cpp
index 1270f936d1..76b41b9eee 100644
--- a/src/qt/optionsmodel.cpp
+++ b/src/qt/optionsmodel.cpp
@@ -15,7 +15,7 @@
 #include <chainparams.h>
 #include <index/blockfilterindex.h>
 #include <interfaces/node.h>
-#include <kernel/mempool_options.h> // for DEFAULT_MAX_MEMPOOL_SIZE_MB
+#include <kernel/mempool_options.h> // for DEFAULT_MAX_MEMPOOL_SIZE_MB, DEFAULT_MEMPOOL_EXPIRY_HOURS
 #include <mapport.h>
 #include <net.h>
 #include <net_processing.h>
@@ -33,6 +33,8 @@
 #include <interfaces/wallet.h>
 #endif
 
+#include <chrono>
+
 #include <QDebug>
 #include <QLatin1Char>
 #include <QSettings>
@@ -614,6 +616,8 @@ QVariant OptionsModel::getOption(OptionID option, const std::string& suffix) con
         return qlonglong(gArgs.GetIntArg("-maxorphantx", DEFAULT_MAX_ORPHAN_TRANSACTIONS));
     case maxmempool:
         return qlonglong(node().mempool().m_max_size_bytes / 1'000'000);
+    case mempoolexpiry:
+        return qlonglong(std::chrono::duration_cast<std::chrono::hours>(node().mempool().m_expiry).count());
     default:
         return QVariant();
     }
@@ -965,6 +969,25 @@ bool OptionsModel::setOption(OptionID option, const QVariant& value, const std::
         }
         break;
     }
+    case mempoolexpiry:
+    {
+        if (changed()) {
+            const auto old_value = node().mempool().m_expiry;
+            const std::chrono::hours new_value{value.toLongLong()};
+            std::string strNv = value.toString().toStdString();
+            node().mempool().m_expiry = new_value;
+            gArgs.ForceSetArg("-mempoolexpiry", strNv);
+            gArgs.ModifyRWConfigFile("mempoolexpiry", strNv);
+            if (new_value < old_value) {
+                LOCK(cs_main);
+                auto node_ctx = node().context();
+                assert(node_ctx && node_ctx->mempool && node_ctx->chainman);
+                auto& active_chainstate = node_ctx->chainman->ActiveChainstate();
+                LimitMempoolSize(*node_ctx->mempool, active_chainstate.CoinsTip());
+            }
+        }
+        break;
+    }
     default:
         break;
     }
diff --git a/src/qt/optionsmodel.h b/src/qt/optionsmodel.h
index a5a32ff662..df760517f7 100644
--- a/src/qt/optionsmodel.h
+++ b/src/qt/optionsmodel.h
@@ -83,6 +83,7 @@ public:
         mempoolreplacement,
         maxorphantx,
         maxmempool,
+        mempoolexpiry,
         OptionIDRowCount,
     };
 
diff --git a/src/txmempool.h b/src/txmempool.h
index 754b84850a..fdaab1e10f 100644
--- a/src/txmempool.h
+++ b/src/txmempool.h
@@ -463,7 +463,7 @@ public:
     using Options = kernel::MemPoolOptions;
 
     int64_t m_max_size_bytes;
-    const std::chrono::seconds m_expiry;
+    std::chrono::seconds m_expiry;
     const CFeeRate m_incremental_relay_feerate;
     const CFeeRate m_min_relay_feerate;
     const CFeeRate m_dust_relay_feerate;