IG's Helpdesk gave me the link below.
https://www.ig.com/au/help-and-support/cfds/market-details/what-are-igs-dealing-hours#:~:text=We%20are%20normally%20open%2024,ticket%20'market%20info'%20tab
It doesn't have RUB/JPY & INR/JPY, but it has the following. So, I suppose RUB/JPY trading hours are the same us USD/RUB & INR/JPY as GBP/INR....
USD/RUB: 17.00-04.00GBP/INR: 13.30-07.00