请问运行完这个程序大概需要花多长时间？

本人准备学习 python 和机器学习，刚刚搭建好环境，从书上抄了一段程序试验一下，无奈运行了两天还没出结果。CPU 占用率一直接近 100%。请各位帮忙看一下是我的程序有问题呢还是真的没运行完？大概需要多少时间？我的配置是 E5-2650,8 核 16 线程，主频好像是 2.0G ，8G 内存。
程序如下：
# Load libraries
import matplotlib.pyplot as plt
import numpy as np
from sklearn.datasets import load_digits
from sklearn.ensemble import RandomForestClassifier
from sklearn.model_selection import validation_curve

# Load data
digits = load_digits()

# Create feature matrix and target vector
features, target = digits.data, digits.target

# Create range of values for parameter
#param_range = np.arange(1, 250, 2)
param_range = np.arange(1, 250, 25)

# Calculate accuracy on training and test set using range of parameter values
train_scores, test_scores = validation_curve(
# Classifier
RandomForestClassifier(),
# Feature matrix
features,
# Target vector
target,
# Hyperparameter to examine
param_name="n_estimators",
# Range of hyperparameter's values
param_range=param_range,
# Number of folds
cv=3,
# Performance metric
scoring="accuracy",
# Use all computer cores
n_jobs=-1)

# Calculate mean and standard deviation for training set scores
train_mean = np.mean(train_scores, axis=1)
train_std = np.std(train_scores, axis=1)

# Calculate mean and standard deviation for test set scores
test_mean = np.mean(test_scores, axis=1)
test_std = np.std(test_scores, axis=1)

# Plot mean accuracy scores for training and test sets
plt.plot(param_range, train_mean, label="Training score", color="black")
plt.plot(param_range, test_mean, label="Cross-validation score",
color="dimgrey")

# Plot accurancy bands for training and test sets
plt.fill_between(param_range, train_mean - train_std,
train_mean + train_std, color="gray")
plt.fill_between(param_range, test_mean - test_std,
test_mean + test_std, color="gainsboro")

# Create plot
plt.title("Validation Curve With Random Forest")
plt.xlabel("Number Of Trees")
plt.ylabel("Accuracy Score")
plt.tight_layout()

plt.legend(loc="best")
plt.show()

程序实际上就一个函数 validation_curve，就是看一下不同的超参数对随机森林决策精度的影响。