Battery duration

In standby mode and without charging, how many hours does the battery go from 100% to 0% approximately? To me in one night from 100% to 30%..
And it use about 50% to do cut area of about 54mq
Its normal?

Hola, mi a1 al 100% a lo mejor en 5h, depende si hace calor o mas frio y depende si hay pendiente o mas giros gastara mas bateria o menos.