Same problem too since the beginning.
I couldn’t do nothing all day because of it. No matter how many time I’ve refresh data, always the same message:
Hey! Something went wrong with sync.
Last sync error: Failed! The request couldn’t process fast enough, please increase the maximum execution time on your server. If that doesn’t help, check your server error logs.. Try to refresh data. If error persists, contact customer support.
With more than 1,000 products each refresh data takes about 1 hour.
So I’ve wasted my entire day.
Sick and tired of it!