Sweating varies from person to person. Some people will sweat quickly, whilst for others it will take longer.
If you are not sweating as much or as quickly as you would like, try pre-heating for longer, taking a warm shower before the session, and make sure you drape a large towel over your shoulders to trap heat.
Even without visible sweat, the infrared heat offers benefits like muscle relaxation,
reduced inflammation, improved blood flow, release of heat-shock proteins, and
improved skin health.