j5 cant open after updating to marshemallow j5 cant open after updating to marshemallow and it display the word (samsung) in the screen for 20 hours without opening

tried restarting and removed the battery and the same happens
It mostly happens when an incompatible ROM or KERNEL is installed on the phone. It is known as boot-loop, the phone never leaves the booting screen. To fix this issue in most cases, you have to change to a different ROM or KERNEL.
In your case it is the problem with the ROM as you mentioned that you updated to Marshmallow. It happens mostly when you try to update it yourself and not from OTA updates, if you really did update it yourself just flash a different ROM insuring that ROM is compatible with your device model.