Why I said like that earlier because once I submitted a tx that had fee of 20sat/vb a while ago but even after a day it never got accelerated then I increased the fee to 25sat/vb and submitted then its included in the very next block of them.
It cannot be adopted as a rule, and it is risky to send a transaction with a 25sat/vb fee, especially if you are in a hurry or want to complete the transaction within a week. The previous period also witnessed low fees due to the holiday season and the end of the year, and high fees may return again soon.
Talking about after successfully submitting for acceleration to viabtc tool, the TX will likely be included in the next block they mine and they mine 1 block for every 90 minutes which means 25sat/byte seems moderate and the only problem will be finding a slot in the 100 slots per hour which is kind of difficult in the last few weeks.