If you tell the truth and fit the bill, then there isnt much that can stop you getting residency.

Timescales.. well, how longs a piece of string?! Resdency can be finalised in as quickly as 1 month, or you can drag it out for up to 2 years!

Of course, it only takes 2 years if you dont act upon everything until very last minute. Average timescale, probably 4 months in all.