We are nearing 3 months of this App Review process.
The Shopify App Review Team takes 48 hours between every interaction now. This is what they call “in conversation”. This is the case even if you respond to their queries in minutes.
For us, after resolving ALL the app reviewer issues raised, we thought we were on the home stretch. Alas! The reviewer attempted to test Instagram App functionalities (while using the web), unmarked a resolved issue and left us hanging for another 48 hours!!
I sincerely suggest not investing in “building for Shopify” unless they can fix the quality of their App Review process…Or keep around ~100 days buffer if you planning anything around it!!