Raspberry static IP + dhcp

Edit /etc/network/interfaces

and put this

# interfaces(5) file used by ifup(8) and ifdown(8)

# Please note that this file is written to be used with dhcpcd

# For static IP, consult /etc/dhcpcd.conf and 'man dhcpcd.conf'

# Include files from /etc/network/interfaces.d:

source-directory /etc/network/interfaces.d

auto lo eth0 eth0:0

iface lo inet loopback

iface eth0 inet dhcp

iface eth0:0 inet static

address 192.168.250.254

netmask 255.255.255.0

allow-hotplug wlan0

iface wlan0 inet manual

    wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

allow-hotplug wlan1

iface wlan1 inet manual

    wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

DHCP client timeout

Edit /etc/dhcp/dhclient.conf

uncomment the line #timeout 60