Create a count consecutive variable which resets to 1 based on POSIXct date

Follow up to this: Create a count-consecutive variable which resets to 1

and the solution worked great. Now I have below, where date is POSixct:

df<-data.frame(group=c(1, 1, 1, 1, 2, 2, 2), 
               date=c("2000-01-01 00:00:00", "2000-01-03 00:00:00", "2000-01-04 07:07:40", "2000-01-05 09:09:00", "2000-01-09 00:00:00", "2000-01-10 14:00:00", "2000-01-11 13:00:00"),
               want=c(1,1,2,3,1,2,1),
               want2=c(3,3,3,3,2,2,2))
library(anytime)
df<-df %>% mutate(date = anytime::anytime(str_c(date, sep= '')))

  group                date want want2
1     1 2000-01-01 00:00:00    1     3
2     1 2000-01-03 00:00:00    1     3
3     1 2000-01-04 07:07:40    2     3
4     1 2000-01-05 09:09:00    3     3
5     2 2000-01-09 00:00:00    1     2
6     2 2000-01-10 14:00:00    2     2
7     2 2000-01-11 13:00:00    1     2

I want to begin counting when the 'next day' is after 24 hrs but before 48 hrs.

Trying this without success, because I think the diff function gives me a result in seconds:

df %>%
    group_by(group) %>%
    group_by(group2 = cumsum(c(TRUE, diff(date)<86400&diff(date)>172800))), add = TRUE) %>%
    mutate(wantn = row_number()) %>%
    group_by(group) %>%
    mutate(want2n = max(wantn)) %>%       
    select(-group2)