Marriage Visitor Visa

Hi,
I'm an Indian citizen and working in UK on tier-2 visa (Ending on July 2015)
My girl friend is having Ukrainian passport, we both want to marry in UK in couple of months
But, I found that the marriage visitor visa(for my girl friend) is for 6 Months
So, my queries are -
Do we BOTH need to leave UK within 6Months when her visa will be expired? As my project work will continue for a year, so I need to stay back for few more days

If, only she has to leave within 6 months then can she come back to UK on another visa , probably tourist visa for couple of months ?

Thanks in advance !!

Smruti wrote:Do we BOTH need to leave UK within 6Months when her visa will be expired? As my project work will continue for a year, so I need to stay back for few more days

A person may remain until leave expires or curtailed or subject to removal.

See also Visitor Guidance > Frequency and duration of visits.