diff --git a/ChessCubing.App/Components/SiteMenu.razor b/ChessCubing.App/Components/SiteMenu.razor
index ec02073..8faea2b 100644
--- a/ChessCubing.App/Components/SiteMenu.razor
+++ b/ChessCubing.App/Components/SiteMenu.razor
@@ -119,6 +119,9 @@
         <p class="auth-modal-copy">
             L'authentification se fait maintenant directement dans l'application, sans redirection vers une page externe.
         </p>
+        <p class="auth-modal-copy">
+            La connexion reste memorisee sur ce navigateur pendant 30 jours.
+        </p>
 
         <div class="auth-modal-switch">
             <button class="@BuildModeButtonClass(AuthMode.Login)" type="button" @onclick="SwitchToLogin" disabled="@IsSubmitting">Se connecter</button>
diff --git a/ChessCubing.Server/Program.cs b/ChessCubing.Server/Program.cs
index 43e9469..7a26a19 100644
--- a/ChessCubing.Server/Program.cs
+++ b/ChessCubing.Server/Program.cs
@@ -42,10 +42,12 @@ builder.Services
     {
         options.Cookie.Name = "chesscubing.auth";
         options.Cookie.HttpOnly = true;
+        options.Cookie.IsEssential = true;
         options.Cookie.SameSite = SameSiteMode.Lax;
         options.Cookie.SecurePolicy = CookieSecurePolicy.SameAsRequest;
+        options.Cookie.MaxAge = TimeSpan.FromDays(30);
         options.SlidingExpiration = true;
-        options.ExpireTimeSpan = TimeSpan.FromDays(7);
+        options.ExpireTimeSpan = TimeSpan.FromDays(30);
         options.Events = new CookieAuthenticationEvents
         {
             OnRedirectToLogin = context =>
@@ -526,6 +528,7 @@ static string? NormalizeOptionalValue(string? value, string fieldName, int maxLe
 
 static async Task SignInAsync(HttpContext httpContext, KeycloakUserInfo userInfo)
 {
+    var issuedAt = DateTimeOffset.UtcNow;
     var claims = new List<Claim>();
 
     if (!string.IsNullOrWhiteSpace(userInfo.Subject))
@@ -567,7 +570,8 @@ static async Task SignInAsync(HttpContext httpContext, KeycloakUserInfo userInfo
         {
             IsPersistent = true,
             AllowRefresh = true,
-            ExpiresUtc = DateTimeOffset.UtcNow.AddDays(7),
+            IssuedUtc = issuedAt,
+            ExpiresUtc = issuedAt.AddDays(30),
         });
 
     httpContext.User = principal;