The initial question appears faulty. If you can 'conceptualize' it, 'think' about it, 'it' now has the quality of 'existence', if nowhere else but in your mind, your thoughts. What I think you might have actually meant, is to ask... if 'time' is 'Real'. Nope. 'Now' has no depth. (See; Planck moment) The 'moment' in which you 'exist', Now, is a Planck moment 'existing' outside the context/concept of time. With no 'time', there can be no 'space' nor 'change' nor 'materiality' or any other percepts existing any otherwhere than in and as your 'concepts'. All moments 'existing' concurrently. Big Bang (thought), then... nothing else. No 'time'. We tend to take a select assortment of 'moments', line them up in a string, imagining things like 'cause and effect', 'time', 'motion', space, etc... Pretty ingenious, huh? But like 'us', 'time' does 'exist'.