The STOCKS Act requires trade disclosures within 30 days but the penalty is only $200 so in theory it lags at most 30 days and maybe less depending on the whims of the Rep/Senator in question. More info at the link below, there are predictably some problems with compliance and the lag means the price change they were potentially reacting to might have already happened but there are examples where it hadn't. eg: We learned about some Members dumping stocks after the confidential briefing before COVID really hit the US.
It's a mixed bag, quicker reporting doesn't really hurt them specifically until they're required to report them in advance of the trade because any time after it they've already made the sale/purchase so you knowing a bit sooner after the trade doesn't really affect their plays. (unless they're gambling on options I guess)
The reports are public so you can scroll through them, the most common pattern (I'm just eyeballing it I haven't found their download to graph it out properly) looks like they just do bulk reports every 30 days so you actually get a mix of old and new trades in each report.
