Typically, one would increase the withdrawal to be consistent with the level of drop. This is where a lot of people need the guidance.
So to make it a simple example -
30 to 20 drop is a drop of 10mg, but it is a 33% drop relative to the starting dose <<< this is the important part
20 to 10 drop is ALSO a drop of 10mg, but is a 50% drop relative to the 20mg starting dose, therefore it will be more difficult.
As a result you would consider 33 days for the first drop and 50 days for the second drop to keep things balanced.
It is always a question of listening to your body and if you feel good, then you can go that little bit quicker.
I would personally be concerned about dropping the Dulox at the same time as the Diazepam.
I will allow Hat to weigh in, but I am sure he will agree that withdrawals should be done one at a time, unless there are serious reasons for it. If you end up having to go back on previous doses because the withdrawal is too much, then you will end up with kindling whereby each additional withdrawal before more difficult. Having been there myself, I can tell you it is no party. Coming off pregabalin and escitalporam at the same time during Christmas 2018 (I think?!).... a whole week in bed barely even managing to get myself to the bathroom. This following an overdose of diazepam which landed me in an ambulance to hospital. Lucky to still be here.
Withdrawals are better off not planned too much as things will change along the way - hopefully for the better. As I said, you might find that you are able to cope and can keep going, but you have to give your body time to adjust with each drop.
IUN