24 hour in transit with multiple stopovers

I have a visa granted with 1 entry to go from the UK to Guangzhou. We are staying in Guangzhou for 4 days and then travelling to Hong Kong but my flight back to the UK is through China stopping and Guangzhou and Chengdu. Can I use the 24 direct transit? (Total time in PRC from landing to departure is 17 hours) Are various stopovers permitted? And would I have any issues given that I was granted with 1 entry? Many thanks for your help!