time spent on a area from GPS trace

Use a statistics calculator to find the min and max time for each area, then a date time calculator to work out the difference between min and max

thanks @egomm for your answer

i made a test with your proposal but it can't detect when a device go on other area and come back on the first area. i explain with an example :

i would like to have 4 results

in PLACE 1 from 2019-01-01 10:00 to 2019-01-01 10:01

in PLACE 2 form 2019-01-01 10:02 to 2019-01-01 10:03

in PLACE 1 from 2019-01-01 10:04 to 2019-01-01 10:05

in PLACE 3 from 2019-01-01 to 10:06 2019-01-01 10:06

but with your proposal i ve got only 3 results

in PLACE 1 from 2019-01-01 10:00 to 2019-01-01 10:05

in PLACE 2 form 2019-01-01 10:02 to 2019-01-01 10:03

in PLACE 3 from 2019-01-01 to 10:06 2019-01-01 10:06

In that case, you need to create groupings to use in the statistics calculator. Adjacent attribute handling in the attribute creator will allow you to assign a group, e.g.

time_on_area.fmwt