May I know how long it's takes from chengdu airport to Guanghan?

The distance is about 42 miles (68 km). You may take airport shuttle bus line 2 to the terminus: North Railway Station (about 25 minutes). Then, take a taxi to Zhaojuesi Bus Station for about CNY 15 (about 10 minutes). Afterwards, take a coach to Guanghan for CNY 17 (about 1 hour). :)