diff --git a/R/doc.R b/R/doc.R
index f182f2d..1c9c2e8 100644
--- a/R/doc.R
+++ b/R/doc.R
@@ -59,7 +59,7 @@
 #' 
 #' @examples
 #' ## In practice, you should not use `.local` argument. 
-#' unique_id <- sample(c(LETTERS, 0:9), 8) |> paste(collapse = '')
+#' unique_id <- as.numeric(Sys.time())
 #' bookname <- paste(Sys.info()[['sysname']], unique_id, sep = '.')
 #' bb <- init(bookname, .local = TRUE)
 #' add_preamble(bb, open = FALSE)
@@ -202,7 +202,7 @@ NULL
 #' 
 #' @examples
 #' ## In practice, you should not use `.local` argument. 
-#' unique_id <- sample(c(LETTERS, 0:9), 8) |> paste(collapse = '')
+#' unique_id <- as.numeric(Sys.time())
 #' bookname <- paste(Sys.info()[['sysname']], unique_id, sep = '.')
 #' init(bookname, .local = TRUE)
 #' bb <- BiocBook(bookname)
diff --git a/man/BiocBook-editing.Rd b/man/BiocBook-editing.Rd
index 15de224..ea30a45 100644
--- a/man/BiocBook-editing.Rd
+++ b/man/BiocBook-editing.Rd
@@ -110,7 +110,7 @@ existing Dockerfiles
 
 \examples{
 ## In practice, you should not use `.local` argument. 
-unique_id <- sample(c(LETTERS, 0:9), 8) |> paste(collapse = '')
+unique_id <- as.numeric(Sys.time())
 bookname <- paste(Sys.info()[['sysname']], unique_id, sep = '.')
 bb <- init(bookname, .local = TRUE)
 add_preamble(bb, open = FALSE)
diff --git a/man/BiocBook.Rd b/man/BiocBook.Rd
index 6a75676..1882f61 100644
--- a/man/BiocBook.Rd
+++ b/man/BiocBook.Rd
@@ -189,7 +189,7 @@ can be listed with
 
 \examples{
 ## In practice, you should not use `.local` argument. 
-unique_id <- sample(c(LETTERS, 0:9), 8) |> paste(collapse = '')
+unique_id <- as.numeric(Sys.time())
 bookname <- paste(Sys.info()[['sysname']], unique_id, sep = '.')
 init(bookname, .local = TRUE)
 bb <- BiocBook(bookname)