From Frankfurt ( approx.2 hrs):
Get on to motorway direction Darmstadt/Basel A5, which at Darmstadt then turns into the A 67/A6 towards Mannheim/Heilbronn. You stay on the A6 past heilbronn and at the junction calles Weinsberger Kreuz follow signs to Nürnberg, still on the A6. Carry on for another approx. 50 kms until exit 44, which is exit for Ilshofen- Wolpertshausen and Langenburg. Once you get off the motorway just follow signs to Langenburg, it's only another 10 minutes.
From Stuttgart (approx. 1.15 hrs.):
Follow signs for the A8 motorway towards Pforzheim/Stuttgart/ Leonberg (not towards Munich). At junction called Leonberger Dreieck get onto motorway A81 towards Heilbronn. Stay on the A81 until you get to Heilbronn and junction Weinsberger Kreuz, where you get onto the A6 towards Nürnberg. From then follow instructions as above.
From Munich ( approx. 2,5 hrs.):
Leave Munich and get onto Motorway A9 towards Nürnberg. Stay on the A9 until Nürnberg ( approx 1 hr) where you will get to a junction called Kreuz Nürnberg Ost, where you have to get onto the A6 towards Heilbronn. You can also exit slightly before a junction Dreieck Nürnberg/Feucht, follow signs towards Nürnberg until you hit junction Nürnberg Süd, where again you have to get onto the A6 towards Heilbronn. (This is a slightly shorter way but a bit more confusing.)
Once on the A6 towards Heilbronn another 50 minutes until you get to exit 44 with signs for Ilshofen/Wolpertshausen/Langenburg, where you get off and follow signs to Langenburg.