Hi,

Please refer to the code below:

class ProductTemplate(models.Model):

    _inherit = 'product.template'

    delivery_lead_time_hours = fields.Float(

        string='Customer Lead Time (Hours)',

        compute='_compute_delivery_lead_time_hours',

        inverse='_inverse_delivery_lead_time_hours',

    )

    @api.depends('sale_delay')

    def _compute_delivery_lead_time_hours(self):

        for rec in self:

            rec.delivery_lead_time_hours = rec.sale_delay * 24

    def _inverse_delivery_lead_time_hours(self):

        for rec in self:

            rec.sale_delay = rec.delivery_lead_time_hours / 24

Hope it helps.