add estimated seconds column

README.md

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+---
+dataset_info:
+  features:
+  - name: estimated_seconds
+    dtype: float32
+  - name: book
+    struct:
+    - name: id
+      dtype: string
+    - name: title
+      dtype: string
+  - name: language
+    dtype: string
+  - name: text
+    dtype: string
+  - name: section
+    struct:
+    - name: id
+      dtype: string
+    - name: num
+      dtype: string
+    - name: title
+      dtype: string
+  - name: url
+    dtype: string
+  - name: reader
+    struct:
+    - name: reader_id
+      dtype: string
+    - name: display_name
+      dtype: string
+  splits:
+  - name: train
+    num_bytes: 112931959
+    num_examples: 411357
+  download_size: 19540439
+  dataset_size: 112931959
+configs:
+- config_name: default
+  data_files:
+  - split: train
+    path: data/train-*
+---

data/train-00000-of-00002.parquet

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+oid sha256:0d180595aade2c729f0100c2d5b125c55c0f41f6dbf5dba5c69e3396b01b833c
+size 9688130

data/train-00001-of-00002.parquet

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+version https://git-lfs.github.com/spec/v1
+oid sha256:207a16a6ecbb7539d3bd780a86160dd10ce4fb6358695c4c66d2b43660e79ba5
+size 9852309