Android RecyclerView with gridlayout smoothScrollTo() speed

I have a recyclerview with gridlayoutmanager.

If I run the code

recycler.smoothScrollTo(adapter.getItemCount())

the recycler scrolls really fast to the last element. I tried some solutions on Stackoverflow to make the scrolling slower, but all apply to Linearlayoutmanager not Gridlayoutmanager.

Any help?

My simple working solution currently is still implementing a timer then working with it.

        final CountDownTimer scrollUp_timer = new CountDownTimer(50000, 30) {
        @Override
        public void onTick(long millisUntilFinished) {
            if (layoutManager != null && layoutManager.findFirstVisibleItemPosition() != 0) searchRecyclerView.smoothScrollToPosition(layoutManager.findFirstVisibleItemPosition()-1);
        }

            @Override
            public void onFinish() {
                try{
                }catch(Exception e){
                // log
                }
            }
        };

        scrollUp.setOnDragListener(new View.OnDragListener() {
            @Override
            public boolean onDrag(View view, DragEvent dragEvent) {
            layoutManager = ((GridLayoutManager)searchRecyclerView.getLayoutManager());
            int action = dragEvent.getAction();
            if (action == DragEvent.ACTION_DRAG_ENTERED) {
                scrollUp_timer.start();

            } else if (action == DragEvent.ACTION_DRAG_EXITED) {
                searchRecyclerView.scrollBy(0,0);
                scrollUp_timer.cancel();
            }
            return true;
        }
    });