As Salamu Aleykum Is it allowed to make like 30min everday for Istighfar since I have seen a clip of Shaykh Hisham at Tahiri may Allah preserve him in good like before sleeping or would it be Biddah JazakAllahu Khayran

Ustadh AbdulAziz al-Haqqan
It is not a bid'ah as long as you do not hold that this time or this amount is itself a sunnah, you are only organising your own time, so do it and sometimes leave it.