Add Windows to the grub menu and increase grub timeout
From Pengwings
Increase timeout
Edit grub defaults to add timeout
sudo vim /etc/defaults/grub
Add timeout:
GRUB_TIMEOUT=30
Make grub always appear on boot
ujust configure-grub
Add Windows Boot Manager to grub
Execute this command to regenerate grub menu, this also adds Windows Boot Manager to the menu
ujust regenerate-grub