diff --git a/zephcore/boards/esp32/heltec_wifi_lora32_v3/board.conf b/zephcore/boards/esp32/heltec_wifi_lora32_v3/board.conf
index 2be2e46..6c633d4 100644
--- a/zephcore/boards/esp32/heltec_wifi_lora32_v3/board.conf
+++ b/zephcore/boards/esp32/heltec_wifi_lora32_v3/board.conf
@@ -42,3 +42,8 @@ CONFIG_ESPTOOLPY_FLASHSIZE_8MB=y
 # survives. Do NOT try to pin it =n here: the symbol is not assignable with the
 # parent off, and Kconfig answers with a warning while keeping y. It is inert.
 CONFIG_POWER_DOMAIN=n
+
+# Single button, ENTER emitted via a zephyr,input-longpress filter (see
+# board.overlay): the default 500ms double-press confirm window (shutdown/
+# DFU/offgrid) is too short for two ~1s holds, see Kconfig help text.
+CONFIG_ZEPHCORE_UI_CONFIRM_WINDOW_MS=3000
diff --git a/zephcore/boards/esp32/heltec_wifi_lora32_v4/board.conf b/zephcore/boards/esp32/heltec_wifi_lora32_v4/board.conf
index ef71dbe..5b8e612 100644
--- a/zephcore/boards/esp32/heltec_wifi_lora32_v4/board.conf
+++ b/zephcore/boards/esp32/heltec_wifi_lora32_v4/board.conf
@@ -22,3 +22,8 @@ CONFIG_ZEPHCORE_SX126X_HELTEC_REG_PATCH=y
 # Measured (MeshCore issue #1708): TX=18 → ~27 dBm radiated, practical efficiency peak.
 # TX=10 → ~20 dBm; TX=22 → ~27 dBm (PA saturated, same as TX=18, extra current only).
 CONFIG_ZEPHCORE_DEFAULT_TX_POWER_DBM=12
+
+# Single button, ENTER emitted via a zephyr,input-longpress filter (see
+# board.overlay): the default 500ms double-press confirm window (shutdown/
+# DFU/offgrid) is too short for two ~1s holds, see Kconfig help text.
+CONFIG_ZEPHCORE_UI_CONFIRM_WINDOW_MS=3000
diff --git a/zephcore/boards/esp32/heltec_wireless_tracker/board.conf b/zephcore/boards/esp32/heltec_wireless_tracker/board.conf
index a2e53ec..d5bae2b 100644
--- a/zephcore/boards/esp32/heltec_wireless_tracker/board.conf
+++ b/zephcore/boards/esp32/heltec_wireless_tracker/board.conf
@@ -25,3 +25,8 @@ CONFIG_ESPTOOLPY_FLASHSIZE_8MB=y
 # already preserved with privacy ON because start_adv() advertises with
 # BT_LE_ADV_OPT_USE_IDENTITY (stable identity address, never an RPA), so there
 # is no need to disable privacy for Android.
+
+# Single button, ENTER emitted via a zephyr,input-longpress filter (see
+# board.overlay): the default 500ms double-press confirm window (shutdown/
+# DFU/offgrid) is too short for two ~1s holds, see Kconfig help text.
+CONFIG_ZEPHCORE_UI_CONFIRM_WINDOW_MS=3000
diff --git a/zephcore/boards/esp32/lilygo_t3s3/board.conf b/zephcore/boards/esp32/lilygo_t3s3/board.conf
index 1f61166..c23d077 100644
--- a/zephcore/boards/esp32/lilygo_t3s3/board.conf
+++ b/zephcore/boards/esp32/lilygo_t3s3/board.conf
@@ -23,3 +23,8 @@ CONFIG_BT_DIS_MODEL_NUMBER_STR="LilyGo T3S3 (SX1262)"
 # SX1262 — 22 dBm TX power (MeshCore variant default)
 CONFIG_ZEPHCORE_DEFAULT_TX_POWER_DBM=22
 CONFIG_ZEPHCORE_MAX_TX_POWER_DBM=22
+
+# Single button, ENTER emitted via a zephyr,input-longpress filter (see
+# board.overlay): the default 500ms double-press confirm window (shutdown/
+# DFU/offgrid) is too short for two ~1s holds, see Kconfig help text.
+CONFIG_ZEPHCORE_UI_CONFIRM_WINDOW_MS=3000
diff --git a/zephcore/boards/esp32/meshnology_w12/board.conf b/zephcore/boards/esp32/meshnology_w12/board.conf
index 32f9981..43fd133 100644
--- a/zephcore/boards/esp32/meshnology_w12/board.conf
+++ b/zephcore/boards/esp32/meshnology_w12/board.conf
@@ -53,3 +53,8 @@ CONFIG_SPIRAM_MODE_OCT=y
 # class node and even the minimum is above the EU 868 14 dBm ERP limit.
 CONFIG_ZEPHCORE_DEFAULT_TX_POWER_DBM=5
 CONFIG_ZEPHCORE_MAX_TX_POWER_DBM=13
+
+# Single button, ENTER emitted via a zephyr,input-longpress filter (see
+# board.overlay): the default 500ms double-press confirm window (shutdown/
+# DFU/offgrid) is too short for two ~1s holds, see Kconfig help text.
+CONFIG_ZEPHCORE_UI_CONFIRM_WINDOW_MS=3000
diff --git a/zephcore/boards/esp32/ttgo_tbeam/board.conf b/zephcore/boards/esp32/ttgo_tbeam/board.conf
index fd7c6b7..506e186 100644
--- a/zephcore/boards/esp32/ttgo_tbeam/board.conf
+++ b/zephcore/boards/esp32/ttgo_tbeam/board.conf
@@ -55,3 +55,8 @@ CONFIG_ZEPHCORE_OFFLINE_QUEUE_SIZE=128
 # Making T-Beam safe needs DRAM reclaimed (contacts/queue are already trimmed
 # above), not a larger number here.  Tracked separately.
 CONFIG_HEAP_MEM_POOL_SIZE=32768
+
+# Single button, ENTER emitted via a zephyr,input-longpress filter (see
+# board.overlay): the default 500ms double-press confirm window (shutdown/
+# DFU/offgrid) is too short for two ~1s holds, see Kconfig help text.
+CONFIG_ZEPHCORE_UI_CONFIRM_WINDOW_MS=3000