well the legend says that the citta sits in samadhi for 7 days max, so strive for that.
for sati sampajanna, ie mindfulness, there is no need to sit. You do it when you eat, when you walk , when you clean the house, and it is the continuous activity: each hour of each day of each week you track thoughts and sanna and vedana, in order to swap bad thoughts, which are that
And what, bhikkhus, is the unwholesome? Destroying life, taking
what is not given, misconduct in sensual pleasures, lying, malicious
speech, frivolous talks, covetousness, ill-will and wrong view: this
is called, bhikkhus, the unwholesome.
And what, bhikkhus, is the wholesome? Abstaing from destroying life,
abstaining from taking what is not given, abstaining from misconduct
in sensual pleasures, abstaining from lying, abstaining from malicious
speech, abstaining from frivolous talks, non-covetousness,
non-ill-will and right view: this is called, bhikkhus, the wholesome.
The fruits of mindfulness are that:
Bhikkhus, heedfulness should be practiced in four instances. Which
four? Abandon bodily misconduct and develop bodily good conduct; do
not be negligent towards it. Abandon verbal misconduct and develop
verbal good conduct; do not be negligent towards it. Abandon mental
misconduct and develop mental good conduct; do not be negligent
towards it. Abandon wrong view and develop right view; do not be
negligent towards it.
Bhikkhus, heedfulness, mindfulness and protection of the mind should be practiced by oneself in four instances. Which four?
Heedfulness, mindfulness and protection of the mind should be
practiced by oneself [thinking:] 'May my mind not become avid on
account of things that induce avidity.' Heedfulness, mindfulness and
protection of the mind should be practiced by oneself [thinking:] '
May my mind not become averse to things that induce aversion.'
Heedfulness, mindfulness and protection of the mind should be
practiced by oneself [thinking:] 'May my mind not become deluded on
account of things that induce delusion.' Heedfulness, mindfulness and
protection of the mind should be practiced by oneself [thinking:] 'May
my mind not become intoxicated by things that intoxicate.'
When you get good at mindulfness, the citta will sit in samadhi and the sañña and vedana will become good, meritorious, and when you have those jhanas, you do vipassana like that
Venerable sir, is there a single quality declared by the Blessed
One—the one who knows, the one who sees, worthy & rightly
self-awakened—where the unreleased mind of a monk who dwells there
heedful, ardent, & resolute becomes released, or his unended
fermentations go to their total ending, or he attains the unexcelled
security from the yoke that he had not attained before?”
“Yes, householder, there is…”
“And what is that one quality, venerable sir…?”
“There is the case, householder, where a monk, withdrawn from
sensuality, withdrawn from unskillful qualities, enters & remains in
the first jhana: rapture & pleasure born from withdrawal, accompanied
by directed thought & evaluation. He reflects on this and discerns,
‘This first jhana is fabricated & intended. Now whatever is fabricated
& intended is inconstant & subject to cessation.’ Staying right there,
he reaches the ending of the mental fermentations. Or, if not,
then—through this very Dhamma-passion, this Dhamma-delight, and from
the total wasting away of the first five Fetters—he is due to be
reborn [in the Pure Abodes], there to be totally unbound, never again
to return from that world.
https://suttacentral.net/an11.16/en/thanissaro