Market order trades should be instant. If there is a significant delay, or the trade has been unsuccessful, please get in touch with support who can investigate the issue further.
Limit or advanced order types may never trigger - there has to be a buyer/seller willing to pay the price you have listed your trade at.
If there is, it should execute instantly.
Please see https://support.lbx.com/hc/en-gb/articles/360011863634-Advanced-Order-Types