Bank Statements for 2 or 5 years Standard Visitor Visa

[Zulqarnain]

Hi,

I would like to apply for 2 or 5 years standard visitor visa for my mum so she can regularly visit me from Pakistan. She has been to UK in 2016 on 6 months standard visitor visa already.

My query is regarding the bank statements which I need to submit for her new applications for 2 or 5 years standard visitor visa. It was easy for 6 months visa when I said she would visit me for 1 month only and sent them bank statements showing funds to support her 1 month stay but when it comes to regular visits in 2 or 5 years visa, how would I now demonstrate that I would be able to fund her 2 to 3 or maybe less or more visits during her 2 or 5 years standard visitor visa?

If possible, it would be great if someone can please mention average amount which should be good enough to support 2 or 5 years visitor visa?

Many thanks.

Zayk