Naturalization is the most common way for becoming a ‘EU citizen’ for foreigners. Each country have different requirement and you are expected to live and have continuous residence for certain number of years (permanent residency requirement) eg. studying, business, family ties etc..
You must also have good knowledge of local language and fully integrate to culture in order to apply for Citizenship through naturalization.
Please see below the number of years of naturalizing time required to acquire citizenship in these european countries..
| EU country | Naturalisation Time |
| Albania | 5 years |
| Austria | 10 years |
| Andorra | 20 years |
| Belgium | 5 years |
| Bulgaria | 5 years |
| Czech Republic | 10 years |
| Croatia | 10 years |
| Cyprus | 8 years |
| Denmark | 9 years |
| Estonia | 8 years |
| France | 10 years |
| Finland | 5 years |
| Germany | 8 years |
| Georgia | 5 years |
| Greece | 7 years |
| Hungary | 8 years |
| Iceland | 7 years |
| Ireland | 5 years |
| Italy | 10 years |
| Malta | 6 years |
| Moldova | 10 years |
| Macedonia | 8 years |
| Montenegro | 10 years |
| Monaco (Monte Carlo) | 10 years |
| Netherlands | 5 years |
| Poland | 8 years |
| Portugal | 6 years |
| Romania | 8 years |
| Russia | 3-5 years |
| Spain | 10 years |
| Switzerland | 12 years |
| Slovenia | 10 years |
| Slovakia | 13 years |
| United Kingdom | 6 years |
| Liechtenstein | 30 years |
| Latvia | 10 years |
| Lithuania | 10 years |
| Luxembourg | 7 years |
| New Zealand | 5 years |
| Norway | 7 years |
| Poland | 10 years |
| Serbia | 3 years |
| Sweden | 5 years |
Source: here
