Currently, Coins.ph has a target interval of sending batch transactions at a maximum interval of 2 minutes, if not sooner.
For external Bitcoin and Bitcoin Cash transactions, Coins.ph batches transactions before posting them to the blockchain. This is an industry best practice that reduces fees for users and reduces traffic on the blockchain.
Coins.ph is able to process outgoing transfers more efficiently with batching since it takes up less space in the network compared to multiple smaller transactions. The smaller size of batched transactions also translate to a lower fee in the blockchain.
For more on transaction batching, see here.