Using basic strategy for the particulaqr game I’m playing, I know that that I should be hitting at least minimum pay hands for a certain percentage of the hands. For example, if I’m playing deuces wild, I should be getting a FOAK every 15-20 hands. If I don’t then there;s a good chance that the maching I’m playing has gone cold & I will switch machines. So, I would suggest watching the number of winning hands you get in a certain time frame. Or, if you are absolutely convince that a particular machine is going to win or you just can’t leave it, you can alway pull back on the amount you are betting until you get a couple of decent hits. I found that by getting a set of VP strategy cards reduced my losses significantly and enabled me to learn the games so I break even on more sessions than I lose. Winning sessions are less frequent but getting better! I can usually put $20 in a full pay JOB quarter machine & play max bet for 2-3 hours beffore I donate my 20 or win a few bucks.