Hi,
whit the help of this Thread from @rlkoshak i build this:
Contact FHT_Bad_Fenster "Bad Fenster[MAP(fht_fenster.map):%s]" <iftswindow1w> (FHT, FHTfenster)
DateTime FHT_Bad_Fenster_LastUpdate "Bad Fenster letztes Update [%1$tm.%1$td.%1$tY %1$tH:%1$tM]" <itimeclock> (FHT, FHTfensterUpdate)
Switch FHT_Bad_Fenster_Timer "Bad Fenster Timer" <itimetimer> (FHT, FHTfensterTimer) {expire="15m,command=OFF" }
Number FHT_Bad_Fenster_offenZeit "Bad Fenster offen Zeit[%s]" <itimetimer> (FHT, FHToffenZeit)
Number FHT_Bad_Fenster_maxoffenZeit "Bad Fenster max öffnungs Zeit[%s]" <itimetimer> (FHT, FHTmaxoffenZeit)
rule "Fensterüberwachung"
when
Item FHT_Bad_Fenster changed or
Item FHT_Buero_Fenster_Hof changed or
Item FHT_Buero_Fenster_Strasse changed or
Item FHT_Wohnzimmer_Fenster_Tur changed or
Item FHT_Wohnzimmer_Fenster_Bal changed or
Item FHT_Wohnzimmer_Fenster_Hof changed or
Item FHT_Schlafzimmer_Fenster changed or
Item FHT_Kueche_Fenster changed
then
val logname = 'FENSTERÜBERWACHUNG'
Thread::sleep(100)
val fenster = FHTfenster.members.filter[s|s.lastUpdate("mapdb") !== null].sortBy[lastUpdate("mapdb")].last as ContactItem
val timer = FHTfensterTimer.members.filter[t | t.name == fenster.name+"_Timer"].head as SwitchItem
val lastUpdate = FHTfensterUpdate.members.filter[dt | dt.name == fenster.name + "_LastUpdate"].head as DateTimeItem
lastUpdate.postUpdate(new DateTimeType)
val StringBuilder msg = new StringBuilder
msg.append = transform("MAP", "fenster.map", fenster.name)
if(fenster.state == OPEN) {
timer.sendCommand(ON)
msg.append(" wurde geöffnet")
}
else {
timer.postUpdate(OFF)
sendCommand(fenster.name+"_offenZeit", "0")
msg.append(" wurde geschlossen")
}
var alert = false
if(Tageszeit.state.toString == "Nacht" && fenster.state == OPEN){
alert = true
msg.append(" und es ist Nacht")
}
if(Anwesend.state == OFF){
alert = true
msg.append(" und niemand Zuhause")
}
if(alert){
msg.append("!")
FensterAlarm.sendCommand(msg.toString)
}
logInfo(logname, msg.toString)
if(Anwesend.state == OFF){
sendNotification("xxx", msg.toString)
}
end
rule "Fenster Timer ausgelaufen"
when
Item FHT_Bad_Fenster_Timer received command OFF or
Item FHT_Buero_Fenster_Hof_Timer received command OFF or
Item FHT_Buero_Fenster_Strasse_Timer received command OFF or
Item FHT_Wohnzimmer_Fenster_Tur_Timer received command OFF or
Item FHT_Wohnzimmer_Fenster_Bal_Timer received command OFF or
Item FHT_Kueche_Fenster_Timer received command OFF or
Item FHT_Schlafzimmer_Fenster_Timer received command OFF or
Item FHT_Wohnzimmer_Fenster_Hof_Timer received command OFF
then
val logname = 'FENSTERALARM'
Thread::sleep(100)
val timer = FHTfensterTimer.members.filter[t|t.lastUpdate("mapdb") !== null].sortBy[lastUpdate("mapdb")].last as SwitchItem
var fensterName = timer.name.split("_Timer").get(0)
val fenster = FHTfenster.members.filter[z | z.name == fensterName].head as ContactItem
var offenZeit = FHToffenZeit.members.filter[o | o.name == fenster.name+"_offenZeit"].head as NumberItem
val maxoffenZeit = FHTmaxoffenZeit.members.filter[m | m.name == fenster.name+"_maxoffenZeit"].head as NumberItem
var erlaubt = maxoffenZeit.state as Number
var dauer = offenZeit.state as Number
val StringBuilder msg = new StringBuilder
msg.append = transform("MAP", "fenster.map", fenster.name)
if(fenster.state == OPEN) {
dauer = dauer + erlaubt
sendCommand(offenZeit, dauer)
if( dauer == erlaubt ) {
msg.append(" schon ")
msg.append(dauer)
msg.append(" Minuten offen!")
} else {
msg.append(" immer noch offen! (")
msg.append(dauer)
msg.append("min)")
}
logInfo(logname, msg.toString)
if( Anwesend.state == OFF && dauer == erlaubt ) {
sendNotification("xxx", msg.toString)
sendNotification("xxx", msg.toString)
}
if( Virtuell_x1_Zuhause.state == ON ) {
sendNotification("xxx", msg.toString)
}
if( Virtuell_x2_Zuhause.state == ON ) {
sendNotification("xxx", msg.toString)
}
sendCommand(timer, ON)
}
end
After a couple of days it seems to work 
i hope it helps somebody
Cheers
Chris