How long did it take for ZZ Top to grow their beards?

Related questions

1. Does bones die in Season 12?
2. Is Angela from bones really ZZ Top's daughter?
3. Does ZZ Top still have beards?
4. Was Angela really pregnant in bones?
5. Does Hodgins and Angela get divorced?

Tags

1. #records
2. #beards
3. #chest
4. #break
5. #length
6. #album
7. #which
8. #warner
9. #released
10. #signed
11. #gibbons
12. #extended
13. #years
14. #during