Maintenance fund tier 1 dependent

Hi All,

Please anyone can answer.
I am British citizen through tier 1 general route,in June 17 my wife dependent tier 1 visa will expire before eligible for ilr in 2018,
Now my question is how much maintenance fund require for her in a bank(it will be on my name) and for how long amount will be remain in bank.
I have 2 kids both are British citizen.

Regards

£630 for 90 days.

https://www.gov.uk/tier-1-general/family-members

Don't forget you will also have to pay the immigration health surcharge of £600 PLUS the visa application fee.