There are no trading limits or withdrawal limits on Mushino. You can trade and withdraw as much you want.
The only limit is the position size limit. This is the maximum position size you can have at a given time. The limit is shown below:
Max Position Size
BTC-Perp: $2,000,000
ETH-Perp: $1,000,000
You can also check the Max Position Size Limit through the Mushino Contract Specifications (it is labeled as "Max Interest"):
BTC-Perp: https://mushino.com/app/funding?key=about_the_pair&pair=BTC_USD_PERP
ETH-Perp: https://mushino.com/app/funding?key=about_the_pair&pair=ETH_USD_PERP