Its 6 months on Tuta. I have a pop up set on my calendar alerting me every 4 months. It tells me to quickly log into my Tuta Accounts thereby resetting the "clock" on the login timetables. I do the same with my Protonmail stuff at the correct timetable for them. Seems silly but its easy and quick to do. I almost never need to follow the timers because I log in frequently but this allows me to sleep well at night with NO chance of losing on of my very private accounts. Sidenote: if you lose a free Tuta account you can get it back by turning it into a premium/paid account. Depends on how important the files and attachments are to your world!!