diff --git a/zshenv b/zshenv
index a638077..5041d78 100644
--- a/zshenv
+++ b/zshenv
@@ -11,6 +11,7 @@ export GREEN='\033[1;32m'
 export YELLOW='\033[1;33m'
 export BLUE='\033[34;40m'
 export MAGENTA='\033[0;35m'
+export MAGENTAB='\033[1;35m'
 export CYAN='\033[36;40m'
 export WHITE='\033[0;37m'
 export WHITEB='\033[1;37m'
diff --git a/zshrc b/zshrc
index 638b3bb..751c242 100644
--- a/zshrc
+++ b/zshrc
@@ -498,6 +498,47 @@ function tilastyear() {
 	fi
 }
 ## }}}
+## Double spent time on a task {{{
+## "double" cause by default my tasks runs for 25 minutes
+function tidouble() {
+	# Default duration time to add to a task
+	tidouble_extra_time="25mins"
+
+	# Verify argument
+	if [ "${#}" -eq 1 ]; then
+		## Get the first arg as task ID
+		tidouble_task_id="${1}"
+	else
+		## If no argument or more than one
+		## Ask the user to choose an ID in tasks from the yesterday {{{
+		timew summary from yesterday :ids
+
+		printf '%b' "Enter the ${MAGENTAB}ID${RESET} of the task to double spent time should be doubled : "
+		read -r tidouble_task_id
+		## }}}
+	fi
+
+	# If no task with this ID exists, exit function {{{
+	if ! timew summary :year :ids | grep --quiet -- " @${tidouble_task_id} "; then
+		printf '%b' "No available task in the last year with ${REDB}${tidouble_task_id}${RESET} ID."
+		return 1
+	fi
+	# }}}
+
+	# Get task's description from all task of this year
+	tidouble_task_desc=$(timew summary :year :ids | sed -n "s/.*@\(${tidouble_task_id} .*\)/\1/p" | sed 's/   */ − /g')
+
+	printf '%b' "Add ${tidouble_extra_time} to \"${MAGENTAB}${tidouble_task_desc}${RESET}\" [Y/n] ? "
+	read -r tidouble_confirmation
+
+	# Check confirmation
+	if printf -- '%s' "${tidouble_confirmation:=y}" | grep --quiet --word-regexp -- "y"; then
+		timew lengthen @"${tidouble_task_id}" "${tidouble_extra_time}" || return 0
+		timew split @"${tidouble_task_id}" || return 0
+		printf '%b' "${tidouble_extra_time} were added to \"${MAGENTAB}${tidouble_task_desc}${RESET}\" task."
+	fi
+}
+## }}}
 
 # }}}