const myTimepicker = new mdb.Timepicker(document.getElementById('von'),{format24:true,minTime:"07:45",maxTime:"14:25",increment:true})

so you can choose time from 7:45 to 12:00 and from 19:00 to 24:00 and with min/maxHour

const myTimepicker = new mdb.Timepicker(document.getElementById('von'),{format24:true,minHour:"7",maxHour:"14",increment:true})

you get only 7:00 to 12:00

i think this is not a feature ;-)