Task.h

#import <Foundation/Foundation.h>
#import <CoreData/CoreData.h>


@interface Task : NSManagedObject

@property (nonatomic, retain) NSString * title;
@property (nonatomic, retain) NSNumber * duration;

- (NSString *)durationString;
- (NSString *)minutesString;

@end

Task.m

#import "Task.h"


@implementation Task

@dynamic title;
@dynamic duration;

- (NSString *)durationString
{
    if ((int)self.duration == 1) {
        return @"1 Pomodoro";
    } else {
        return [NSString stringWithFormat:@"%@ Pomodoros", self.duration];
    }
}

- (NSString *)minutesString
{
    return [NSString stringWithFormat:@"%@ minutes", [NSNumber numberWithInt:(int)self.duration*25]];
}

@end