Is it possible to set a minimum holding period for assets in my account?

Unfortunately no such functionality exists to limit the number of trades made in an account at this time. If you would like to configure precautionary settings for individual trades, you may do so through TWS…

At this time there is no way to place a monthly recurring trade.

However, you could set a series of Alerts to trigger an order at a designated date and time (in this case at the same time each month). To set up Alerts in Trader Workstation, right click on the symbol you wish to set the Alert for and left click on the "Alert" bell icon in the right click menu. Click the "Advanced Settings" button to choose a "Time" Alert. Click "Next" and a "Create Condition" window will populate where you can configure the time you wish to have your order triggered. Once configured, click Finish…

There is no feature that allows one to set a specific "Risk" limit for an IBKR account but clients do have tools available to help manage the risk of open positions.

The Account Window displays real time account values which allows one to monitor the account's margin compliance…

Time & Sales is provided as part of the free trial account, however, as it is a form of market data it's subject to a 15 minute delay. This means that you will not be able to review the Time & Sales for a given trade period until 15 minutes after that period (or the simulated trade which took place in that time frame), has passed…