That's not tilt, that's not being patient and getting bored.
Give yourself something else to do on the side. Play music or listen to a podcast. If all you are doing is single tabling one tournament for hours it can be very boring, especially if you are not playing for prize money that means something to you.
Any time one is not being "present" and is playing sub-optimally, it's a form of tilt. Since the OP recognizes the problem, it's now a matter of identifying the cause. Subsequently, we work on a solution.
In the case of boredom, I have found that some physical awareness makes a huge difference. Breathing, sitting with excellent posture or even doing a few squats or push-ups between hands is a huge help. Peppering our session with physical activity, focused breathing and staying well hydrated can really contribute to being able to focus for long periods of time.
Boredom is an effect of not being fully present/focused on whatever it is one is doing. It is a symptom of a distracted mind that is chattering to itself about other things than the problem at hand. If one is 100% present and focused on the current domain, there is exactly 0% left over for boredom.
To the OP: Try a Primed Mind subscription for a month. Also consider getting some Elliot Roe MP3s from pokermindcoach.com. Meditation can be a superb tool for improving your ability to focus on a single task for long periods.
GL!
(Disclaimer: I subscribe to Primed Mind and have all of Elliot Roe's MP3s.)