Reflect the actual duration of bootstrapping GitLab

Signed-off-by: Takuya Noguchi <takninnovationresearch@gmail.com>

changelogs/unreleased/gdk-bootstrapping-takes-more-time.yml

+---
+title: Reflect the actual duration of bootstrapping GitLab
+merge_request: 605
+author: Takuya Noguchi
+type: other

internal/badgateway/roundtripper.go

@@ -108,7 +108,7 @@ window.setTimeout(function() { location.reload() }, {{.ReloadSeconds}} * 1000)
 
 <pre>{{.Error}}</pre>
 
-<p>If you just started GDK it can take 30-60 seconds before GitLab has finished booting. This page will automatically reload every {{.ReloadSeconds}} seconds.</p>
+<p>If you just started GDK it can take 60-300 seconds before GitLab has finished booting. This page will automatically reload every {{.ReloadSeconds}} seconds.</p>
 <footer>Generated by gitlab-workhorse running in development mode at {{.Time}}.</footer>
 </body>
 </html>