Linked Helper 2 does not have a certain reset point for your daily limit because Linked Helper counts actions that were made every last 24 hours period, not the last day or fixed period of 24 hours (for example, from 12:01 AM till 12:01 PM). Each action taken is added back exactly after 24 hours from the time it was performed.
Imagine Linked Helper 2 invited 150 profiles today. The first invite went out at 10:00 AM, the second one at 10:08 AM, the third one at 10:20, etc., and LH2 finished at 02:14 PM with 150 actions done.
If the next day Linked Helper 2 won't do any actions, then the number of Last 24 hrs' actions will decrease tomorrow to 149 at 10:00 AM, to 148 at 10:08 AM, to 147 at 10:20, etc., so at 02:14 PM tomorrow the Last 24 hrs' actions number will be 0.
But if any campaign is active and there are profiles in a Queue to process, then as soon as one action slot is freed, Linked Helper starts to process profiles till there are no free action slots. Then it pauses all campaigns until a new action slot is freed, and so on.
In Linked Helper 2 the 150 daily action limit is enabled by default for the safety of our users' LinkedIn accounts and is applied to all campaigns. Please, check this article for more information. This restriction is set for a reason: if you do a lot of actions in a short period of time even manually, LinkedIn may stop you from sending invites - I'm getting "You're out of invitations for now" warning from LinkedIn, or temporary restrict your account: