diff --git a/src/app/api/gemini/floor-plan/route.js b/src/app/api/gemini/floor-plan/route.js
index a8a8b407..c8e09ca4 100644
--- a/src/app/api/gemini/floor-plan/route.js
+++ b/src/app/api/gemini/floor-plan/route.js
@@ -195,6 +195,7 @@ export async function POST(req) {
 
     const buffer = Buffer.from(await file.arrayBuffer())
 
+    const uploadStarted = Date.now()
     const uploadResult = await fileManager.uploadFile(buffer, {
       mimeType: 'application/pdf',
       displayName: file.name || 'floor-plan.pdf',
@@ -202,6 +203,7 @@ export async function POST(req) {
     uploadedFileName = uploadResult.file.name
 
     await waitForFileActive(fileManager, uploadedFileName)
+    const fileReadyMs = Date.now() - uploadStarted
 
     const genAI = new GoogleGenerativeAI(apiKey)
     const model = genAI.getGenerativeModel({
@@ -217,6 +219,7 @@ export async function POST(req) {
 
     const prompt = buildPrompt({ pageMode, facadePages, floorPages })
 
+    const generateStarted = Date.now()
     const result = await model.generateContent([
       {
         fileData: {
@@ -228,6 +231,7 @@ export async function POST(req) {
     ])
 
     const raw = result.response.text()
+    logger.debug('[gemini/floor-plan] timing(ms)', { fileReady: fileReadyMs, generate: Date.now() - generateStarted })
     logger.debug('[gemini/floor-plan] raw response', raw)
     logger.debug('[gemini/floor-plan] usageMetadata', result.response.usageMetadata)
 
diff --git a/src/components/floor-plan/modal/placementShape/PlacementShapeSetting.jsx b/src/components/floor-plan/modal/placementShape/PlacementShapeSetting.jsx
index a7d8fd4b..494cbcee 100644
--- a/src/components/floor-plan/modal/placementShape/PlacementShapeSetting.jsx
+++ b/src/components/floor-plan/modal/placementShape/PlacementShapeSetting.jsx
@@ -40,7 +40,9 @@ const PDF_MAX_FILE_BYTES = 20 * 1024 * 1024
 
 // 분석 요청 타임아웃(ms). 서버 라우트는 파일 처리(최대 60s)+generateContent 로 길어질 수 있어
 // 클라이언트에서 backstop 을 둔다. 이 시간을 넘기면 abort 하여 스피너가 영구 멈추지 않도록 한다.
-const PDF_ANALYZE_TIMEOUT_MS = 120 * 1000
+// gemini-3.1-pro-preview 는 thinking 비활성화가 불가능 + MEDIA_RESOLUTION_HIGH PDF 분석이라
+// 정상 응답도 2분을 넘길 수 있다(실측 120s). 서버 완료 직전에 클라이언트가 끊지 않도록 여유를 둔다.
+const PDF_ANALYZE_TIMEOUT_MS = 300 * 1000
 
 const PDF_PAGE_MODE = {
   ALL: 'all',