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How to Increase Spin Time

TL;DR Version - Get your bearing as clean as possible and don't lubricate it.

Step 1: If your bearing has a cap, remove it.

Step 2: Clean the bearing using some sort of solvent. Common solvents include isopropyl alcohol (any strength), acetone, brake cleaner, or paint thinner. I've seen people use WD-40, but if you choose to use it, make sure you clean all of it out using another solvent. WD-40 is not a cleaner nor a lubricant, and if you don't get it all out of the bearing, the residual WD-40 will attract dust and gunk up your bearing. Trust me, I'm a chemist. ;)

If your bearing came lubricated, you want to get rid of all that lube. Get a little glass dish/cup, pour some solvent in it, and soak your bearing. Swoosh it around, spin the bearing, and just work it so the solvent can get inside the bearing and get all the crap out. You may need to repeat this several times.

If you have a plastic spinner body, only use isopropyl alcohol to clean your bearing because almost all of the other solvents will melt the plastic! You can get around this by removing the bearing from the plastic body before you start cleaning it, but some people may not feel comfortable removing the bearing.

Although pure ABS plastic is not affected by isopropyl alcohol, ABS filaments that are used in 3D printing have a small amount of sytrene in them, and styrene is affected by isopropyl alcohol. Most ABS filaments have less than 1% sytrene content, so while your spinner isn't going to fall apart, some of you may feel more comfortable applying isopropyl alcohol to the bearing only, especially if you plan to clean it regularly. Spinners made with a lower purity ABS filament could possibly experience more weakening after repeated exposure to isopropyl alcohol, but this also could possibly be related to the structural integrity of lower purity ABS plastic.

You can also clean the bearing by using hot soapy water, but make sure you get all the water out of the bearing.

Step 3: After your bearing is all clean, take a can of compressed air and blow out your bearing. This is crucial if you used water to clean your bearing, especially if you have non-ceramic bearings. Water will obviously rust things, so you want to get rid of that. The compressed air isn't that big of a deal if you used a strong solvent, because it'll evaporate pretty quickly. You can help it along by spinning the bearing and blowing on it or using a hair dryer. (Note: Solvents are flammable and although there is little risk, be careful when using a hair dryer/heat gun when solvents and their fumes are present. I am not responsible if you set yourself on fire.)

Don't use a paper towel or a rag to dry your bearing, because you don't want lint getting in your newly cleaned bearing!

Step 4: Put your spinner back together and you're done!