Pi taking a long time to connect to the tablets.
Restart the Pi and check if Pi has enough free space i.e 5 GB.
Steps to check free space in Pi
Step-1- Remove SD card from Pi.
Step-2- Insert the SD card into SD Card reader.
Step-3- Connect it with Computer/Laptop.
Step-4- When computer/Laptop detects the SD card, Right click on it.
Step-5- Go to Properties.
Step-6- Free Space will be displayed here.