The quantity limits set for various orders for equities and ETFs are described in the following documents:
[Japanese]
URL:
https://www.jpx.co.jp/equities/products/etfs/trading/tvdivq0000004thw-att/nlsgeu000003ag74.pdf[English]
URL:
https://www.jpx.co.jp/english/equities/products/etfs/trading/tvdivq0000004thw-att/b5b4pj0000029fp9.pdfAs for the hard limit for CBs, it is "orders exceeding a face value of 3 billion yen." As noted in *1 of TSE Equity Strategic Planning No. 139 (2018), please refer to "Order Quantity Check Program for ToSTNeT Market" (October 30, 2009, TSE Equity Strategic Planning No. 237).