data =  df_pages.reset_index().sort_values('num_pages')

ax = sns.barplot(data,y="collection",x="num_pages")

# label points
for i in ax.axes.containers:
    ax.bar_label(
        i,
    )

# make the labels fit the limits
xlim = ax.axes.get_xlim()[1]
new_xlim = xlim + 14600

ax.axes.set_xlim(0, new_xlim)

for i in ax.axes.containers:
    an = ax.bar_label(
        i,
    )

# `an` is a list of all Annotations

an[0].get_window_extent()

>>> Bbox(88.66956472198585, 388.99999999999994], [123.66956472198585, 402.99999999999994)

def get_text_size(anno):  # Annotation
    """ TODO: get array of annos, find the leftmost one etc."""
    bbox = anno.get_window_extent()
    ext = bbox.bounds
	# > (91.43835300441604, 336.19999999999993, 35.0, 14.0)
    x=ext[2]
    y=ext[3]
    return x,y

"""
ano = an[1]
bbox = ano.get_window_extent()
bbox.bounds
> (91.43835300441604, 336.19999999999993, 35.0, 14.0)
"""
get_text_size(an[6])