Rudra that’s odd, that amount should have come through immediately (between ABN and bunq).
I would still kindly ask you to report this to support via Private Matters so they can look into this issue. If the fault is on bunq’s side then they can look into the cause and fix it.
I understand it’s irritating if you expect something to happen and then ..... nothing happens. However, even the most expensive cars also sometimes break...
For instant transfers to bunq you can use the top-up or bunq.me feature. Basically you’re paying to yourself via iDeal system. This has never let me down and works instantly. And it supports all dutch banks!