According to Baidu map, the journey from Guangzhou to Huizhou is about 147.3 km, and it takes about 1 hour 49 minutes, passing through Guangzhou Ring Expressway and Jiguang Expressway.
You can also reach your destination via Guangfozhao Expressway and Jiguang Expressway. The whole journey is about 144.9 km and takes about 1:58 minutes.