CHINA TOURIST 4G PREPAID SIM -Recharge

Is it possible to buy a CHINA TOURIST 4G PREPAID SIM -RECHARGE with data, calls and texts? And does this SIM card not expire, so I can use it for at least 90 days?

YES, this card valid for 90 days after activation by default. Also, can be extend after 90 days by purchasing "keep number service":
https://www.loyomobile.com/products/keeping-number-fee

How long is it between purchasing a data add-on and it’s activation on the phone?

purchasing data add-ons and activation will be completed in minutes.

Can SIM cards be purchased for business use, where a single SIM card can be reused for periodic travel to China? Are passports required for SIM card purchase? Thanks.

YES. All SIM cards can be purchased for business use. You can extend the validity period by purchasing 'Keeping number service'. Passport required for SIM with a phone number.