shopify products import stucked after reach 30k products

Hi

After the imported products reach 30k, the import almost stuck

1. because we are importing it collection by collection, and some collections have the same products. and the import log shows products exist(which is correct)
is this the reason for import stuck?

2. if we want to import all products from shopify to woocommerce, and we can not leave the pages open until it finished, because we have too many products.
Is there any way to run the import automatically at WordPress backend?

3.currently, we already import 30k, and the rest 50k looks like going to take several weeks,
is there a way we can make it faster?

looking forward to your reply.

thanks