While time, temperature and pressure vary from substrate to substrate, there are some general guidelines that can send you in the right direction. The chart below, courtesy of Sawgrass Technologies, is a great starting point for many common sublimation substrates.
There are free downloadable Tech Tips for sublimation items available through jpplus.com. Those can be found under the "Tech Docs and Downloads" tabs at the bottom of each product page.
JPPlus has a team of sublimation experts available to help with any questions you may have. Contact Customer Service at firstname.lastname@example.org or at 800-869-7800 Monday through Friday 8am to 8pm CST and they can put you in contact with someone who can help!