sudo eopkg install efibootmgr
Open .bashrc located in your home directory, and add this line at the end:
alias reboot-windows="sudo efibootmgr --bootnext $(efibootmgr | grep Windows | tail -n1 | cut -d' ' -f1 | cut -d't' -f2 | sed s/.$//) && reboot"
The next time you boot, you will be able to just use
reboot-windows to reboot into windows directly.
I find it very useful, because my PC is set to boot by default to Solus, and now when I want to use windows, I don't have to use the motherboard menu to boot into it (that's how I used to do it).